DMM8 ULD - Microphone AKG - Free user manual and instructions

USER MANUAL DMM8 ULD AKG

©AKG 101/2008 L 102/2008 R 103 104 105 106 107 108 109 DMM3 U WATER CONTROL MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz MAX 100 MHz DMM3 U

DMM8 U (UL, ULD)

PROFESSIONAL DIGITAL AUTOMATIC MICROPHONE MIXER

Read the manual before using the equipment!

132 MODE D'EMPLOI

IN 1 IN 2 Off On

• Pin 1 = _
• Pin 2 = a
• Pin 3 = b

OUT L OUT R

L R REC (OUT)

L R REC (OUT) IN - EXPANSION - OUT RS232 USB

Simple line drawing of a room with two doors and a floor, no text or symbols present

ON PEAK IN 2

• Level
• Treble
• Bass
• Low Cut
• Limiter
• Compressor
• Automixing
• Priority
• Pan / Balance
• Delay
• Routing To REC
• Routing To USB
• Equalizer Low
• Equalizer High
• Preset

• Routing To Out
• Monitoring
• Mute

• Level
• Treble
• Bass
• Low Cut
• Compressor
• Automixing
• Priority
• Pan
• Routing To Out
• Routing To Rec
• Routing To USB
• Monitoring
• Mute

• Level
• Treble
• Bass
• Limiter
  Balance
• Delay
• Equalizer
• Monitoring
• Mute

1.1 Purpose of the manual 70

1.2 Retention of the manual 70

1.3 Liability 70

1.4 Warranty 70

2 SCOPE OF SUPPLY 71

2.1 Packing unit 71

2.2 Optional accessories 71

3 SAFETY AND ENVIRONMENT 72

3.1 Safety 72

3.2 Required knowledge and areas of responsibility of the operators/users 73

3.3 Explanation of the symbols used 73

3.4 Correct use 74

3.5 Incorrect use 74

3.6 Environment 74

4 DECLARATION OF CONFORMITY 74

5 DESCRIPTION 75

5.1 Summary 75

5.2 Technical data 75

5.3 Front: Description of the controls 77

5.3.1 Controls for input channels 77

5.3.2 Operating mode / SYSTEM CONTROL 78

5.3.3 Control for stereo outputs 78

5.3.4 Modulation display for stereo outputs 78

5.3.5 Stereo headphone output 78

5.4 Rear: Description of the controls 79

5.4.1 Inputs 80

5.4.2 Gain control 80

5.4.3 Stereo master output 81

5.4.4 Stereo record output 81

5.4.5 Serial control via RS232 81

5.4.6 USB port 82

5.4.7 LAN port 82

5.4.8 Expansion/cascading 83

5.4.9 Phantom power 83

5.4.10 Dante ^TM network 85

5.5 Automix algorithm 85

5.5.1 Dynamic level adjustment 86

5.5.2 Best Mic On 86

5.5.3 Noise Detect 86

5.6 Expansion/cascading 86

6 INSTALLATION AND CONNECTION 88

6.1 Installation 88

6.2 Cascade devices (optional) 88

6.3 Connecting microphones and accessories 88

6.4 Connect to the mains power supply 89

7 FUNCTIONAL DESCRIPTION 90

7.1 Control concept 90

7.2 Operation of the rotary knobs 90

7.2.1 Display of the audio level / VU function 91

7.3 SYSTEM CONTROL 91

7.3.1 SYSTEM CONTROL functions 91

7.3.2 Input channel modes 92

7.3.3 Output channel modes 92

7.3.4 Functions of the stereo headphone output (monitoring output) 92

7.4 DSP functions 93

7.4.1 LEVEL 93

7.4.2 TREBLE 94

7.4.3 BASS 96

7.4.4 LOW CUT 98

7.4.5 LIMITER 100

7.4.6 COMPRESSOR 102

7.4.7 AUTOMIXING 103

7.4.8 PRIORITY 104

7.4.9 PAN / BALANCE 105

7.4.10 DELAY 107

7.4.11 ROUTING TO REC 108

7.4.12 ROUTING TO USB 109

8.4 Cascading devices 117

8.5 Feed via USB and Dante ^TM 117

8.5.1 Processing the feed 117

8.6 Activating phantom power 118

8.7 Using presets 118

8.7.1 Selecting a preset 118

8.7.2 Programming a preset 119

8.7.3 Deleting a preset 119

8.8 Using MUTE 120

8.8.1 Activating MUTE 120

8.8.2 Deactivating MUTE 120

8.9 Activating ROUTING TO OUT 121

8.9.1 For an input 121

8.9.2 For multiple inputs 121

8.10 Deactivating ROUTING TO OUT 121

8.11 Activate/deactivate LOCKED 122

8.11.1 Locking the SYSTEM CONTROL rotary knob 122

8.11.2 Unlocking the SYSTEM CONTROL rotary knob 122

8.11.3 Locking the complete unit 123

8.11.4 Unlocking the complete unit 123

8.11.5 Unlocking individual channels 123

8.11.6 Locking individual channels 124

8.12 Copying configuration data 125

8.12.1 Copying individual values 125

8.12.2 Copying all values 125

8.13 Resetting the factory settings 127

9 TROUBLESHOOTING 129

Publisher	AKG Acoustics GmbH	AKG ACOUSTICS, U.S.
	Laxenburger Straße 254	8500 Balboa Blvd. Dock 15
	1230 Wien	Northridge, CA 91329
	Austria	U.S.A.
	Tel: [phone]	Tel: [phone]
	Fax: [phone]
	[e-mail]	[e-mail]
Copyright	© 2015 AKG Acoustics GmbH
	All rights reserved.
	The information contained in this manual, including any drawings and photos provided, are the intellectual property of AKG Acoustics GmbH.
	In accordance with copyright law, it is not permitted for this documentation or parts thereof to be reproduced or transmitted for any purpose in any form using any means, whether electronic or mechanical, by photocopying, recording or using information storage and information processing systems without the express, written consent of AKG Acoustics GmbH. Forwarding to third parties is not permitted. This manual should be returned to us on request.
FCC Statement	Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:Reorient or relocate the receiving antenna.Increase the separation between the equipment and receiver.Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.Consult the dealer or an experienced radio/TV technician for help.This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.Shielded cables and I/O cords must be used for this equipment to comply with the relevant FCC regulations. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment.
Updates	This manual may be modified without prior notice and does not represent any obligation on the part of AKG Acoustics GmbH.
Version 1.0
Publication date	July 2015/EN

1 General

1.1 Purpose of the manual

This manual is intended to enable you to:

• operate the equipment safely
- use the equipment correctly.

1.2 Retention of the manual

Print out this manual and keep it carefully or store it electronically at an easily accessible location.

Pass this manual on to subsequent owners.

This manual is an important part of the equipment.

Liability

1.3 Liability

AKG Acoustics GmbH accepts no liability, if:

• The equipment is used for purposes other than those described under correct usage.
• Damage is incurred due to incorrect operation
• Unauthorized or non-permitted modifications having been carried out.
• Damage due to out of date documentation.

Warranty

1.4 Warranty

AKG Acoustics GmbH accepts no liability for damage, if

• incorrect operation.
• Unauthorized or non-permitted modifications having been carried out.
• Damage due to out of date documentation.

2 Scope of supply

Packing unit

2.1 Packing unit

Check that the package contains all the parts given below. If anything is missing, please contact your AKG dealer.

• 1 x DMM8 U, DMM8 UL or DMM8 ULD
• 1 x Quick Start Guide
• 1 x IEC EU standard mains cable
• 1 x IEC US standard mains cable

Optional accessories

2.2 Optional accessories

Optional accessories can be found at www.akg.com. Your dealer will be happy to advise.

3 Safety and environment

Safety

3.1 Safety

Caution: Risk of damage

- Protect the equipment against

• direct sunlight
• the impact of significant dust and humidity
• rain

• vibrations or knocks.

• Do not spill any liquids on the equipment and do not allow any other objects to drop through the ventilation slits into the equipment.

• Do not place any containers filled with liquid on the equipment.
• The equipment must only be used in dry rooms.
• The equipment must only be opened, serviced and repaired by authorized personnel. The equipment contains no user-serviceable parts.
• Before connecting the equipment to power, check that the AC mains voltage stated on the integrated power adapter is identical to the AC mains voltage available where the equipment will be used.
• Only operate the equipment on a mains voltage between the 100 and 240 V AC. Using adapters with different output voltage or current types may cause serious damage to the equipment.
• If any solid or liquid should get into the equipment, shut down the system immediately. Disconnect the power cable from the power outlet at once and have the equipment checked by our customer service department.
• If the equipment is not going to be used for a longer time, disconnect the mains cable from the power outlet. Please note that if you switch the equipment off while leaving the mains cable plugged in, it is not fully isolated from the power network.

• Do not place the equipment near heat sources such as radiators, heating ducts, amplifiers, etc.

• To avoid hum or interference, route all audio lines, particularly those connected to the microphone inputs, away from power lines of any type. If you use cable ducts, be sure to use separate ducts for the audio lines.

• Clean the equipment with a moistened (not wet) cloth only. Be sure to disconnect the power adapter from the power outlet beforehand. Never use caustic or scouring cleaners or cleaning products containing alcohol or solvents since these may damage the enamel and plastic parts.
• Only use the equipment for the applications described in this manual. AKG cannot accept any liability for damages resulting from improper handling or misuse.

3.2 Required knowledge and areas of responsibility of the operators/users

• The cascading of the devices is only permitted to be carried out by qualified personnel.
• Qualified expert personnel are able to determine risks and avoid hazards when using the product, based on their professional training, education and experience.

3.3 Explanation of the symbols used

Caution: Risk of damage

Not following the instructions may damage the equipment.

Warning: Hazard due to electric shock

Hazardous situation: Not following the instructions may result in minor or serious injury.

Describes useful information and application notes for efficient operation of the equipment.

Provides reference to more in-depth information and downloads online.

Describes information on the correct disposal of the components described.

3.4 Correct use

The Digital Automatic Microphone Mixer DMM8 U (UL, ULD) is designed solely for mixing audio signals.

3.5 Incorrect use

Any use not given under correct use is regarded as incorrect.

3.6 Environment

• The packaging is recyclable. Dispose of the packaging in an appropriate recycling collection system.
• In case of scrapping the equipment, separate the housing, electronics and cables and dispose of all the components in accordance with the appropriate waste disposal regulations.

4 Declaration of Conformity

This product conforms to the standards listed in the Declaration of Conformity. You can download the Declaration of Conformity at www.akg.com or request it by email from [e-mail].

5 Description

Summary

5.1 Summary

The DMM8 U (UL, ULD) is a 19" Digital Automatic Microphone Mixer. Internal signal processing takes place digitally. The inputs and outputs are available as analog and digital.

It has 6 balanced mono inputs that can be configured as microphone inputs or line inputs (e.g. for wireless microphone receivers).

On the output side it has one balanced master output each for the left and right channels, one stereo recording output and one stereo headphone output.

It has a USB port that can be used as both an input and an output.

Inputs and outputs are controlled via LAN and Dante ^TM networks (optional).

The device has a wide-range power supply unit and is connected to the power network using the mains cable supplied.

In addition to multiple DSP digital signal processing functions, the DMM8 U (UL, ULD) also has innovative automatic mixing functions.

Up to ten DMM8 U (UL, ULD) can be cascaded if the six balanced inputs are not sufficient for your application.

5.2 Technical data

General

General

Dimensions Standard housing for rack mounting, 1

HU

Weight (with packaging) 3.5 kg

Permissible ambient temperature 0 °C ... 50 °C

Air humidity in operation 10 % ... 90 %, non-condensing

Power adapter	Power adapter
	Input voltage 100 ... 240 V AC
	Mains frequency 50 ... 60 Hz
	Max. power intake 75 Watt
	Output voltages 24 V
Inputs	Balanced inputs - Preamplifier
	Gain 0 dB ... 60 dB
	Max. input level +20 dBu
	Common mode rejection >70 dB
	Dynamics >120 dB
	Signal-to-noise ratio (S/N) >90 dB
	Input impedance >8 kΩ
	Equivalent input noise -127 dBu
	Balanced inputs - Phantom power
	Phantom voltage 48 V DC
	Max. supply current per input 10 mA
	Infeed resistors 2 x 6.8 kΩ
	Balanced inputs - Analog/digital converters
	Data format	24 Bit
	Sample frequency	48 kHz
Outputs	Recording and total output
	Max. output level	+20 dBu
	Dynamics >110 dB
	Signal-to-noise ratio (S/N) >90 dB
	Min. load impedance	<100 Ω
	Digital/analog conversion for recording, monitoring and totals output
	Data format	24 Bit
	Sample frequency	48 kHz

Front controls

5.3 Front: Description of the controls

There is a total of nine controls on the front.

1 2 3 4 5 6 7 8 9 10 11

Figure 1: Front of the DMM8 U (UL, ULD)

The following table describes the controls on the front of the DMM8 U (UL, ULD):

No. Description

1 to 6 Microphone or line inputs

7 Operating mode / System Control

8 Stereo output

9 Modulation display for stereo outputs

10 Stereo headphone output

11 Socket for headphone connection

The parameters of the selected audio functions are changed using the controls.

Rotary knobs for inputs

5.3.1 Controls for input channels

The DMM8 U (UL, ULD) has 6 balanced input channels to connect low ohm, dynamic microphones or capacitor microphones and other signal sources, e.g. receivers for wireless microphones. There is a control for each input channel (1 to 6).

Each input channel has a green LED ON and a red LED PEAK.

LED ON

ON is lit when the input channel is prioritized in automatic mode. If the automix function is switched off, ON is lit continuously.

LED PEAK

PEAK is lit if the signal on an input channel comes close to the maximum modulation limit. In this case, the level should be reduced or the input sensitivity changed.

The input sensitivity is modified using the gain regulator on the rear of the connected equipment.

SYSTEM CONTROL

5.3.2 Operating mode / SYSTEM CONTROL

The DMM8 U (UL, ULD) has numerous functions such as volume, tre-bles, bass, auto-mixer functions etc. These functions are selected on the SYSTEM CONTROL (7).

Rotary knobs for outputs

5.3.3 Control for stereo outputs

The control for the stereo outputs are labeled OUT (8). This control is used to change the following parameters on the output channel:

• Volume
- Treble range
- Bass range
- Limitation response
• Balance and delay

Modulation display

5.3.4 Modulation display for stereo outputs

The modulation display (9) under the control for the stereo output channels shows the output level in dB.

Headphone output

5.3.5 Stereo headphone output

Both inputs and outputs can be picked up on the stereo headphone output (10).

Rear controls

5.4 Rear: Description of the controls

On the rear are the sockets for the input channels and output channels as well as the mains connection, etc.

1 2 3 4 5 6 7 8 9 10 11 12 13 15 16 17 18 19 20 21 22 23 24 25 26 USB Drive With Connection Interface USB Drive USB Drive With Connection Interface

Figure 2: Rear of the DMM8 U (UL, ULD)

*only available with DMM8 ULD **only available with DMM8 UL and DMM8 ULD

The following table describes the controls on the rear of the DMM8 U (UL, ULD):

No. Description

1, 5, 6, 10, 11, 15 Input channels

2, 4, 7, 9, 12, 14 Gain control

3, 8, 13 Phantom power

16 Stereo output channel, left

17 Stereo output channel, right

18 Stereo record output

19 DanteTM: *only available with DMM8 ULD

20 Expansion sockets

21 Phoenix terminal (ground / remote control)

22 Serial control (RS232)

23 Modular jack (RJ-45) socket: **only available for DMM8 UL and DMM8 ULD

24 Remote level control

No. Description

25 Mains switch

26 Mains connection

Input channels

5.4.1 Inputs

IN 1 IN 2 Off On

Figure 3: Input

The 6 balanced input channels (1, 5, 6, 10, 11, 15) can be accessed via 3-pin Phoenix sockets. These are labeled IN 1 to IN 6. The input levels can be controlled with the rotary knobs IN 1 to IN 6 on the front panel.

The assignment is labeled via socket IN 3 with:

• Pin 1 = _
• Pin 2 = a
• Pin 3 = b

A switch for the phantom power and a gain control for every channel is located between two XLR sockets.

Gain controller

5.4.2 Gain control

IN 1 IN 2 0 dB0 dB5 dB57 dB Off On

Figure 4: Gain controller

The associated gain control is located next to every input channel (2, 4, 7, 9, 12, 14) to set the input level. The gain controls are equipped with integrated switch for the left side stop.

The input level is set at 0 dB when the left end stop is reached By turning the control clockwise the gain can be increased by max. 57 dB.

Stereo output

5.4.3 Stereo master output

OUT L OUT R

Figure 5: Stereo master output

The device has one balanced master output (16, 17). It is accessible via two 3-pin XLR sockets. The outputs are labeled OUT L and OUT R.

The OUT rotary knob on the front can be used to make settings on the output level of the stereo output.

Stereo record output

5.4.4 Stereo record output

L R REC (OUT)

Figure 6: Stereo record output

Two RCA jacks, labeled REC (OUT) (18) are available for connecting stereo recording equipment. The allocation of the individual channels to the unbalanced stereo recording output can be configured as desired.

Serial control

5.4.5 Serial control via RS232

Figure 7: Serial control

The RS232 socket (21) permits software updates to be carried out and to operate the device via an external control (e.g.: AMX). The pin assignment is as follows:

Pin Function

1 GND

2 TxD

3 RxD

USB port

5.4.6 USB port

RS232 USB LAN

Figure 8: USB port

The USB port (22) can be used to connect the device to a PC to perform firmware updates and permit external control.

The connection is established via a standard MS Windows driver. An Apple driver needs to be installed manually if required.

LAN port

5.4.7 LAN port

RS232 USB LAN

Figure 9: LAN port

The LAN port (23) permits software updates to be carried out and to operate the device via an external control (e.g.: AMX).

Remote control and remote diagnostics are also possible via a web server.

This web server provides a simple and functional user interface that can be opened via a browser and that permits access via LAN infrastructure.

Simultaneous operation via the front panel of the automixer and via the web server is possible: it is preferable for the inputs to be handled via the web server, however.

The automixer is provided with protocol allowing it to be actuated via external software or wirelessly via APP.

These applications can add considerably more functions depending on the programming type and scope, and provide a more complex graphic interface depending on the terminal.

Cascading

5.4.8 Expansion/cascading

L R REC (OUT) IN - EXPANSION - OUT RS232 USB

Figure 10: Expansion

The 8-pin (RJ-45) modular jacks (20) can be used to connect up to 10 devices.

The audio master and the status signal for the automix algorithm are transmitted.

The audio transmission via cascading is carried out in 24Bit. This does not impair the noise values.

Phantom power

5.4.9 Phantom power

IN 1 IN 2 Off On PHANT. PWR

Figure 11: Phantom power

The device is equipped with three switches for phantom power (3, 8, 13).

The corresponding slide switch activates the phantom power supply of +48 V for the inputs located on the left and right.

Ground connection

Simple line drawing of a mechanical or electrical component with no text or symbols

Figure 12: Phoenix terminal

A Phoenix terminal connects the housing to the 0 V potential of the power supply.

Only bridge the 0 V potential with the grounding (factory setting) or connect it to the central system ground, as otherwise the phantom power has no reference point and will not function.

Analog control

⊥ VCA

Figure 13: Phoenix terminal

A linear 50 kΩ potentiometer at the VCA input, labeled "VCA" and "", allows you to vary the master volume.

VCA Poti 50k lin. ⊥

Figure 14: VCA

The linear potentiometer is connected to the VCA input as shown above The resistance at the VCA input is changed by turning the potentiometer This value is input and the volume is changed accordingly The left setting signifies 0% while the right setting signifies 100%.

The output level depends on the master control and the remote level control. The remote level control has the same effect on both masters

Dante™ network

5.4.10 Dante™ network

DANTE OUT) IN - EXPANSION - OUT

Figure 15: Dante ^TM

The DMM8 ULD is equipped with an 8-pin (RJ-45) modular jack labeled DANTE (19).

All inputs and outputs are thereby automatically routed to the Dante ^TM network.

The inputs are routed to the Dante ^TM network after signal processing (treble, bass,...) and after the automix algorithm as direct-out signals.

The output masters are routed before the balance regulator, before volume out and before limiter to the Dante ^™ network as direct out signals.

Settings must be made via the Dante™ receiver unit (e.g. mixing desk).

When cascading automixers, note that only the channels available locally on an automixer can be transmitted via the Dante™ network. If in addition the inputs of another, cascaded device are required, this device must also have a standalone Dante™ interface.

If multiple devices are also to be operated in the automix, these must also be connected via cascading: Specifically, in addition to the master signals, the control signals of the automix algorithm are also transmitted.

Algorithm for Automix

5.5 Automix algorithm

The unit's automix algorithm has 3 basic functions which assess the amount by which an input signal is to be attenuated and the output signal's output

level. The following functions and parameters flow into the automix algorithm:

• Dynamic level adjustment
- Best Mic On
- Noise Detect

Level adjustment

5.5.1 Dynamic level adjustment

The master of all input channels is determined on an ongoing basis. This value is used as the reference value.

If the input channel level is very close or over the reference value, this

channel will be assessed as dominant and will be slightly attenuated. If the input channel level is well below the reference value, this is assessed as ambient noise and be severely attenuated.

If a channel is no longer assessed as dominant, this falls at 1 dB/second and all other nondominant channels increase with the same constant so that the master output level remains constant. The upward adjustment of a channel takes between 3 ms and 5 ms.

Best Mic On

5.5.2 Best Mic On

With two microphones that are positioned close together there is the disadvantage that comb filter effects may arise by canceling the frequency components To suppress these unnaturally dull or hollow signals, only the microphone channel with the highest level is assessed as dominant and switched on.

Noise Detect

5.5.3 Noise Detect

Permanently present interfering signals, whose amplitude are large enough to be assessed as dominant, but whose level and frequency changes are too low, are not assessed as dominant.

Interfering signals such as noise from fans and air-conditioning units are recognized and not used as activation criteria for microphone channels.

Expansion for cascading

5.6 Expansion/cascading

Up to ten devices can be cascaded if the number of inputs on a single device are not sufficient.

The device has two 100 MBit/s Ethernet ports. These are used to exchange control data and audio communication between cascaded devices.

This means that an automixing system can be realized with:

• 60 inputs
• 20 outputs
  • 10 stereo headphone outputs

The master buses for OUT, REC-OUT and HEADPHONE are accessible to the entire system of cascaded devices. Every unit adds its input channels to the master buses, which are transferred via the Ethernet interface. Every unit can monitor and output the master buses.

The automix algorithm also transfers its control data via this interface. This allows the automix algorithm to function system-wide.

6 Installation and connection

The following steps are required for installation and connection of the DMM8 U (UL, ULD):

1. Installation
2. Cascade devices (optional)
3. Connecting microphones and accessories
4. Connect to the mains power supply

6.1 Installation

To install the device, proceed as follows:

Step Description

1 Mount the device into your 19" rack using 4 appropriate rack bolts.

Ensure that the device is securely screwed onto the rack.

Alternatively, the device can be positioned on a stable surface.

6.2 Cascade devices (optional)

Caution: Risk of damage

It is only permitted for this connection to be carried out by authorized, qualified personnel.

It is not permitted to connect the first device in the cascade to the last device.

For the cabling (cascading) of the individual devices via the expansion sockets, see 8.4 Cascading devices on page 117

6.3 Connecting microphones and accessories

Read the user instructions for your microphones and accessories for connection.

Connect the microphones and accessories to the rear of the DMM8 U (UL, ULD) as follows:

Step Description

1 Connect microphones and other signal sources (e.g. receivers for wireless microphones) to the IN inputs
2 Connect outputs OUT L and OUT R to a mixing desk or amplifier
3 Connect the RCA jacks on the stereo recording output REC (OUT) to a recording device

6.4 Connect to the mains power supply

Caution: Risk of damage

Do not connect the unit to the power network until you have established all the audio connections!

Ensure that the input voltage on the DMM8 U (UL, ULD) corresponds to the mains voltage.

To connect the device to the mains, proceed as follows:

Step Description

1 Connect the mains power supply cable to the appropriate socket on the rear panel of the DMM8 U (UL, ULD)
2 Plug the power supply cable into a mains socket

7 Functional description

7.1 Control concept

The device is controlled using the total of 9 rotary knobs on the front panel. These are labeled IN 1 to IN 6, SYSTEM CONTROL, OUT and HEADPHONE.

The rotary knobs on the inputs are each surrounded by an LED ring with 15 yellow LEDs, one green LED and one red LED. The SYSTEM CONTROL rotary knobs and the rotary knobs on the outputs are surrounded by 15 yellow LEDs. The control display under the outputs has 6 green, one yellow and one red LED.

The LED rings help to visualize the rotary knob setting or display signal levels.

Rotary knob

7.2 Operation of the rotary knobs

ON PEAK IN 2

Figure 16: Rotary knob

• Turn the rotary knob clockwise or counter-clockwise to make changes to inputs and outputs and function settings. These changes are shown on the LED ring around the rotary knob. The starting point and the increments on the LED ring will vary according to the function.
• Briefly pressing the SYSTEM CONTROL rotary knob switches the display on the LED rings to VU meter, the display of the actual audio level present.
  When the VU meter mode is activated, the LEVEL LED flashes on the SYSTEM CONTROL rotary knob. Pressing the SYSTEM CONTROL rotary knob again deactivates the VU meter mode.

SYSTEM CONTROL

7.2.1 Display of the audio level / VU function

With the LEVEL function selected, the level set is displayed on the LED rings on the inputs and outputs.

7.3 SYSTEM CONTROL

The SYSTEM CONTROL rotary knob provides the option of selecting various functions on the device.

AUTOMIXING PRIORITY PAN / BALANCE COMpressor LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE DELAY ROUTE TO REC ROUTE TO USB EQUALIZER LOW EQUALIZER HIGH PRESET SYSTEM CONTROL

Figure 17: SYSTEM CONTROL

For selecting the functions and setting parameters, see 8.1 SYSTEM CONTROL: Changing parameters on the device on page 115

SYSTEM CONTROL 7.3.1 SYSTEM CONTROL functions modes

The following functions can be selected via the SYSTEM CONTROL:

• Level
• Treble
• Bass
• Low Cut
• Limiter
• Compressor
• Automixing
• Priority
• Pan / Balance
• Delay
• Routing To REC
• Routing To USB
• Equalizer Low
• Equalizer High
• Preset

Other functions given can be selected by pressing individual rotary knobs or combinations of multiple knobs:

• Routing To Out
• Monitoring
• Mute

Input channel modes

7.3.2 Input channel modes

The input channels have the following function controls:

• Level
• Treble
• Bass
• Low Cut
• Compressor
• Automixing
• Priority
• Pan
• Routing To Out
• Routing To Rec
• Routing To USB
• Monitoring
• Mute

Output channel modes

7.3.3 Output channel modes

The output channels have the following function controls:

• Level
• Treble
• Bass
• Limiter
  Balance
• Delay
• Equalizer
• Monitoring
• Mute

7.3.4 Functions of the stereo headphone output (monitoring output)

The exception to this is the HEADPHONE rotary knob. The stereo head-phone output is always

located in the LEVEL mode, regardless of the SYSTEM CONTROL rotary knob setting.

DSP functions

7.4 DSP functions

Given below are explanations of the individual functions and their operation and effects.

LEVEL

7.4.1 LEVEL

AUTOMIXING PRIORITY PAN / BALANCE COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE DELAY ROUTE TO REC ROUTE TO USB EQUALIZER LOW EQUALIZER HIGH PRESET SYSTEM CONTROL

Figure 18: LEVEL function

All the input and output channels can be controlled in the LEVEL mode.

Turning the rotary knob clockwise increases the volume. Turning it counter-clockwise decreases the volume.

The settings range from - to +15 dB.

At + 15 dB the entire LED ring is illuminated and the acoustic feedback is no longer provided.

The adjustable increments are equal to 1 dB per click from -12 dB to +15 dB. One LED equals 3 dB. The adjustable increments are equal to 3 dB per click from -12 dB to -∞. One LED equals 9 dB.

Figure 19: LEVEL detail

One LED (no. 10) is brighter than the other LED fields to help you find the 0 dB position more easily; the LED field illuminates as soon as the 0 dB level is reached (after the third click, see "Level" detail).

Pressing the SYSTEM CONTROL rotary knob in the LEVEL function switches the display of the inputs and outputs from amplification to modulation.

7.4.2 TREBLE

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO USB ROUTE TO REC DELAY PAN / BALANCE

Figure 20: TREBLE function

All inputs and outputs can be controlled in TREBLE mode.

Figure 21: Adjustment range of the LED ring for the TREBLE function

The TREBLE raises or lowers the audio signal's treble range. The filter is designed as a first order treble shelving filter. The cut-off frequency is 10 kHz.

The settings range from -14 dB to +14 dB. Only the upper middle LED lights up (0 dB) with linear adjustment. More LEDs light up on the left side as the rotary knob is turned further to

the left.

More LEDs light up on the right side as the rotary knob is turned further to the right.

The adjustable increments are equal to 2 dB per click and also correspond to one LED.

Figure 22: Adjustment range for the TREBLE function

BASS

7.4.3 BASS

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO REC ROUTE TO USB DELAY PAN / BALANCE

Figure 23: BASS function

All the input and output channels can be controlled in the BASS mode.

The BASS raises or lowers the audio signal's bass range. The filter is designed as a first order bass shelving filter. The cut-off frequency is 100 Hz.

The settings range from -14 dB to +14 dB. Only the upper middle LED lights up (0 dB) with linear adjustment. More LEDs light up on the left side as the rotary knob is turned further to

the left.

More LEDs light up on the right side as the rotary knob is turned further to the right.

Figure 24: Adjustment range of the LED ring for the BASS function

The adjustable increments are equal to 2 dB per click and also correspond to one LED.

Figure 25: Adjustment range for the BASS function

LOW CUT

7.4.4 LOW CUT

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO REC ROUTE TO USB DELAY PAN / BALANCE

Figure 26: LOW CUT function

All the input channels can be controlled in the LOW CUT function.

The LOW CUT function suppresses low-frequency interference noise. The low cut filter is designed as a second order high-pass filter. The cut-off fre-

quency can be raised by turning the rotary knob in a clockwise direction and lowered by turning it counter-clockwise.

The settings range from 0 Hz (no effect) to 300 Hz (severe attenuation).

One LED is illuminated at 0 Hz, while the entire LED ring is illuminated at 300 Hz.

Figure 27: Adjustment range of the LED ring for the LOW CUT function

The adjustable increments are equal to 20 Hz per click and also correspond to one LED.

Figure 28: Adjustment range for the LOW CUT function

LIMITER

7.4.5 LIMITER

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO USB ROUTE TO REC DELAY PAN / BALANCE

Figure 29: LIMITER function

All the output channels can be controlled in the LIMITER mode.

Turning the rotary knob in a clockwise direction increases the effect, while turning it counterclockwise dampens the effect.

The settings range from +20 dBu to -25 dBu. One LED is illuminated at +20 dBu, while the entire LED ring is illuminated at -25 dBu.

Figure 30: Increments on the LED ring for the LIMITER function

The adjustable increments are equal to 3 dB per click and also correspond to one LED.

Figure 31: Adjustment range for the LIMITER function

COMPRESSOR

7.4.6 COMPRESSOR

AUTOMIXING PRIORITY PAN / BALANCE COMpressor LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE DELAY ROUTE TO REC ROUTE TO USB EQUALIZER LOW EQUALIZER HIGH PRESET SYSTEM CONTROL

Figure 32: COMPRESSOR function

All the input channels can be controlled in the COMPRESSOR mode.

The compressor ratio is fixed. It has a value of 1:2. Turning the rotary knob in a clockwise direction increases the effect, while turning it counterclockwise dampens the effect.

The settings range from +20 dBu to -25 dBu. One LED is illuminated at +20 dBu, while the entire LED ring is illuminated at -25 dBu.

Figure 33: Increments on the LED ring for the COMPRESSOR function

The adjustable increments are equal to 3 dBu per click and also correspond to one LED.

Figure 34: Adjustment range for the COMPRESSOR function

AUTOMIXING

7.4.7 AUTOMIXING

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO USB ROUTE TO REC DELAY PAN / BALANCE

Figure 35: AUTOMIXING function

All the input channels can be controlled in the AUTOMIXING mode.

offon 6 7 8 9 10 5 6 7 8 9 10 4 5 6 7 8 9 10 3 4 5 6 7 8 9 10 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 ONPEAK AUTOMIXING ONPEAK

Figure 36: Adjustment range for the AUTOMIXING function

The automatic mixing functions for the relevant channel are switched on by turning a rotary knob in the clockwise direction. (Entire LED ring is illuminated). Turning the rotary knob counterclockwise switches the automatic mixing function off. (Only one LED is illuminated)

Pressing the rotary knob also switches the function on or off.

PRIORITY

7.4.8 PRIORITY

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO REC ROUTE TO USB DELAY PAN / BALANCE

Figure 37: PRIORITY function

This function can only be active on one single input.

The PRIORITY mode allows you to select which input channel will function as the priority channel. The priority channel then receives a 6 dB advantage in the signal detection in connection with the AUTOMIXING mode.

Figure 38: Adjustment range for the PRIORITY function

The function for the relevant channel is switched on by turning a rotary knob in the clockwise direction. (Entire LED ring is illuminated). Turning the rotary knob counter-clockwise switches the functions off (only one LED is illuminated).

Pressing the rotary knob also switches the function on or off.

Switching on the PRIORITY function on an input channel turns off the function on the previously activated channel.

PAN / BALANCE

7.4.9 PAN / BALANCE

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO REC ROUTE TO USB DELAY PAN / BALANCE

Figure 39: PAN / BALANCE function

The PAN / BALANCE mode allows all the input channels in the panorama and the balance of

all the output channels to be controlled.

Figure 40: Increments on the LED ring for the PAN / BALANCE function

Balance means assignment of a main signal to the output.

Only the upper middle LED lights up (0 dB) with linear adjustment. This LED (0 dB) is also considered to be the starting point for a clockwise or counter-clockwise rotation. More LEDs light up on the left side as the rotary knob is turned further to

the left. More LEDs light up on the right side as the rotary knob is turned further to the right.

If no further output is required from the left output channel of a stereo output, turn the balance controller to the right.

In mono inputs, the signal is assigned equally to stereo left and right as standard. If the input is to be assigned to the left only, turn the rotary knob for the input to the left when the PAN function is active.

The adjustable increments are equal to 6 dB per click and also correspond to one LED.

DELAY

7.4.10 DELAY

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO USB ROUTE TO REC DELAY PAN / BALANCE

Figure 41: DELAY function

The DELAY function can be used to modify the OUT output. This function can be used to delay the left output over the right.

Figure 42: Increments on the LED ring for the DELAY function

The settings range from 0 m to 75 m. One LED is illuminated at 0 m, while the entire LED ring is illuminated at 75 m.

The adjustable increments are equal to 1 m per click. 5 m is equal to one LED.

ROUTING TO REC

7.4.11 ROUTING TO REC

AUTOMIXING PRIORITY COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO USB ROUTE TO REC DELAY PAN / BALANCE

Figure 43: ROUTING TO REC function

All the input channels can be controlled in the ROUTING TO REC mode.

off 6 7 8 9 10 5 6 7 8 9 4 5 6 7 8 9 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 ON PEAK ON PEAK 6 7 8 9 10 5 6 7 8 9 4 5 6 7 8 9 3 4 5 6 7 8 9 2 3 4 5 6 7 1 2 3 4 5 6 ON PEAK ROUTING TO REC

Figure 44: Adjustment option of the ROUTING TO REC function

The function for the relevant channel is switched on by turning the rotary knob in the clockwise direction (entire LED ring is illuminated). Turning the rotary knob counter-clockwise switches the function off (only one LED is illuminated).

Pressing the rotary knob also switches the function on or off.

Switching this on sets the input channel to the OUT master bus.

ROUTING TO USB

7.4.12 ROUTING TO USB

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO REC ROUTE TO USB DELAY PAN / BALANCE

Figure 45: ROUTING TO USB function

All the input channels can be controlled in the ROUTING TO USB mode.

off 6 7 8 9 10 5 6 7 8 9 4 5 6 7 8 9 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 ON PEAK ON PEAK 6 7 8 9 10 5 6 7 8 9 4 5 6 7 8 9 3 4 5 6 7 8 9 2 3 4 5 6 7 1 2 3 4 5 6 ON PEAK ROUTING TO USB

Figure 46: Adjustment range for the ROUTING TO USB function

The function for the relevant channel is switched on by turning the rotary knob in the clockwise direction (entire LED ring is illuminated). Turning the rotary knob counter-clockwise switches the function off (only one LED is illuminated).

Pressing the rotary knob also switches the function on or off.

Switching this on sets the input channel to the USB OUT master bus.

EQUALIZER

7.4.13 EQUALIZER

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO REC ROUTE TO USB DELAY PAN / BALANCE

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO REC ROUTE TO USB DELAY PAN / BALANCE

Figure 47: EQUALIZER function

The function EQUALIZER HIGH and EQUALIZER LOW affects the output OUT: The adjustment is the same for the left and right channel.

If the EQUALIZER HIGH function is selected, the top specified value is actuated; if the EQUALIZER LOW is selected, the bottom specified value is actuated.

E.g.: At EQ 250 Hz / 2kHz, the frequency 250 Hz is actuated in the EQUALIZER LOW function. In the EQUALIZER HIGH function,, the frequency 2 kHz is actuated.

The room equalization can be performed in 12 bands. The raising or lowering of the bands is performed by the 6 rotary knobs for the input channels.

The adjustment range extends from +/-14 dB. Only the upper middle LED lights up with linear adjustment. More LEDs light up on the left side as the rotary knob is turned

further to the left. More LEDs light up on the right side as the rotary knob is turned further to

the right.

Figure 48: Increments on the LED ring for the EQUALIZER function

The adjustment takes place in 2 dB increments.

The center frequencies of the sub-bands are assigned at half-octave intervals.

Figure 49: Adjustment range for the EQUALIZER function

PRESET

7.4.14 PRESET

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER HIGH EQUALIZER LOW ROUTE TO REC ROUTE TO USB DELAY PAN / BALANCE

Figure 50: PRESET function

It is possible store and load 6 different device configurations or device pre-sets (LEVEL, TREBLE, BASS, ... , EQUALIZER).

To do this, the PRESET function is selected on the SYSTEM CONTROL. In addition to the 6 device presets, there is also a work preset: All changes in the settings initially only have an effect on that preset. To store changes permanently, the work preset must be stored under one of the available device presets. Loading a device preset overwrites the work preset and makes it active immediately. After re-starting the device, the last work preset becomes active with the last settings made.

The 6 input rotary knobs provide access to the presets, and their configuration.

Figure 51: PRESET configurations

If only LED 1 lights on an LED ring, this storage location is not configured (see Figure 51, encoder IN 3).

If all LEDs and the red PEAK LED are lit, this storage location is assigned and selected (see Figure 51, encoder IN 1 / USB L).

If only LED 1 and the red PEAK LED are on, this storage location is assigned but not selected (see Figure 51, encoder IN 2 / USB R).

For more information, see 8.7 Using presets on page 118.

LOCKED

7.5 LOCKED

PRIORITY AUTOMIXING COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED IN USB / DANTE PRESET EQUALIZER LOW EQUALIZER HIGH ROUTE TO REC ROUTE TO USB DELAY PAN / BALANCE

Figure 52: LOCKED function

In LOCKED mode the rotary knobs or the entire unit are protected against improper use by means of locking.

For more information, see 8.11 Activate/deactivate LOCKED on page 122

SYSTEM CONTROL

8 Operating the device

8.1 SYSTEM CONTROL: Changing parameters on the device

To change the parameters on the device, proceed as follows:

Step Description

1 Turn to the required function on the SYSTEM CONTROL rotary knob, turning the rotary knob until the LED is lit at the required function.
2 Modify the inputs with the selected function using the IN 1 to IN 6 rotary knobs
3 Modify the outputs with the selected function using the OUT rotary knob

The stereo record output does not have any setting options.

5 minutes after the last change, the SYSTEM CONTROL rotary knob goes back to the LEVEL mode. 1 minute after the last change, the set value is saved automatically.

8.2 Configuring microphones on the DMM8 U (UL, ULD)

To configure the connected microphones and accessories, proceed as follows:

Step Description

1 Press the slider switch and gain control on the rear of the DMM8 U (UL, ULD)

• Select the amplification of the input signals between 0 dB and +57 dB.
• Higher amplification of the input signals is suitable for microphones with a low output level.
• Lower amplification is recommended for microphones with a high output level.
• If you are using capacitor microphones, determine which supply voltage or supply devices these require.
• If your capacitor microphones are suitable for phantom power, switch the phantom power on. To do this, switch the PHANT. PWR slider switch to ON.

2 Switch on the device with the main power switch

Caution: Risk of damage

When using wireless microphones, switch off the phantom power on the inputs where you have connected a receiver to avoid damage to the receiver.

8.3 Monitoring the inputs/outputs

To monitor the inputs and outputs, proceed as follows:

Step Description

1 Hold down the HEADPHONE rotary knob and press to select one or more monitoring source rotary knob

2 Change monitoring source by pressing on another monitoring source.

- The previous monitoring source is switched off.

With inputs, multiple sources can be monitored.

The output can be monitored individually and in stereo.

The REC (OUT) output cannot be monitored.

8.4 Cascading devices

Caution: Risk of damage

It is only permitted for this connection to be carried out by authorized, qualified personnel.

It is not permitted to connect the first device in the cascade to the last device.

To cable the individual devices with the expansion sockets, proceed as follows:

Step Description

1 Cascade the devices as follows using CAT5+ connection cables:

graph TD
    A["REC (OUT) IN - EXPANSION - OUT RS232 USB"] --> B["Block 1"]
    A --> C["Block 2"]
    A --> D["Block 3"]
    E["REC (OUT) IN - EXPANSION - OUT RS232 USB"] --> F["Block 1"]
    E --> G["Block 2"]
    E --> H["Block 3"]
    I["REC (OUT) IN - EXPANSION - OUT RS232 USB"] --> J["Block 1"]
    I --> K["Block 2"]
    I --> L["Block 3"]

For cascading we recommend using only cables from the AKG range of accessories.

All devices are equivalent for the user in terms of their function and response. In cascading, all functions of the individual devices are retained.

Feed via USB and Dante™

8.5 Feed via USB and Dante™

8.5.1 Processing the feed

To feed the input signals via USB or Dante ^TM , proceed as follows:

Step Description

1 Press the SYSTEM CONTROL rotary knob twice briefly (double-click)

• The 6 input controls are switched over for operation.
  • The LEDs IN USB and IN USB/DANTE are permanently lit
• Changes to the input controls no longer affect the 6 analog inputs; only digital inputs 7 to 12
• The remaining operation is the same as on the analog level

The inputs from USB Port are assigned to channels 7 (IN1 / USB L) and 8 (IN 2 / USB R), for devices without Dante™ interface the digital inputs 9 to 12 are without function and inactive.

For devices with Dante ^™ interface, the remaining digital input channels from channel 9 are assigned as follows:

• IN3 / DANTE 1
• IN4 / DANTE 2
- etc.

All digital inputs have the same signal processing functionalities as the analog inputs.

8.6 Activating phantom power

Only bridge the 0 V potential with the grounding (factory setting) or connect it to the central system ground, as otherwise the phantom power has no reference point and will not function.

PRESET

8.7 Using presets

The presets on the DMM8 U (UL, ULD) function in a very similar way to the presets on a car radio.

8.7.1 Selecting a preset

To select a preset, proceed as follows:

Step Description

1 With SYSTEM CONTROL, select the PRESET function

2 Briefly press the rotary knob for the corresponding input or output.

- An acoustic signal (beep) is sounded.

3 Release the rotary knob after the beep

• Device preset is loaded to work preset.

- Settings for the selected device preset are active immediately (all LEDs lit).

8.7.2 Programming a preset

To program a preset, proceed as follows:

Step Description

1 With SYSTEM CONTROL, select the PRESET function

2 Press input rotary knobs (1 to 6) for between 3 and 5 seconds

- An acoustic signal (beep) is sounded.

3 Release the rotary knob after the beep

- The current settings from the work preset are stored under the selected device preset (all LEDs lit).

8.7.3 Deleting a preset

To delete a preset, proceed as follows:

Step Description

1 With SYSTEM CONTROL, select the PRESET function

Step Description

2 Press the rotary knob for the corresponding input or output for between 8 and 10 seconds

- An acoustic signal (beep) is sounded.

3 Release the rotary knob after the beep

- The device preset is deleted and cannot be selected (empty storage location, LED 1 lit).

MUTE

8.8 Using MUTE

8.8.1 Activating MUTE

Inputs and outputs can be switched to MUTE. Proceed as follows:

Step Description

1 In the LEVEL function, briefly press the rotary knob for the corresponding input or output.

• The corresponding channel is muted.
• All LEDs previously lit will flash.
  • The current volume is stored.

The MUTE function cannot be used for the HEADPHONE rotary knob!

8.8.2 Deactivating MUTE

To deactivate the MUTE function proceed as follows:

Step Description

1 Briefly press the rotary knob for the corresponding input or output.

• MUTE function for the corresponding channel is deactivated.
• The volume previously stored is applied.

ROUTING TO OUT

8.9 Activating ROUTING TO OUT

8.9.1 For an input

All inputs can be routed to the OUT output. Proceed as follows:

Step Description

1 Press and hold the OUT rotary knob

Press the rotary knob of the required input

- The corresponding input is routed to the OUT master bus.

8.9.2 For multiple inputs

To route multiple inputs to OUT, proceed as follows:

Step Description

1 Press and hold the OUT rotary knob

Press the rotary knob of the required inputs

- The corresponding inputs are routed to the OUT master bus.

8.10 Deactivating ROUTING TO OUT

To deactivate the ROUTING TO OUT function, proceed as follows:

Step Description

1 Press the rotary knob of the required input

- ROUTING TO OUT is deactivated for the corresponding input.

LOCKED

8.11 Activate/deactivate LOCKED

The following elements can be locked using the LOCKED function:

• SYSTEM CONTROL rotary knob
- Complete unit
- Individual channels

Lock rotary knob

8.11.1 Locking the SYSTEM CONTROL rotary knob

To lock the SYSTEM CONTROL rotary knob, proceed as follows:

Step Description

1 Press the SYSTEM CONTROL rotary knob for longer than 3 seconds
- The LOCKED LED is lit.
- Turning the rotary knob has no function.
- All other rotary knobs are in LEVEL mode and can still be operated.

Unlock rotary knob

8.11.2 Unlocking the SYSTEM CONTROL rotary knob

To unlock the SYSTEM CONTROL rotary knob, proceed as follows:

Step Description

1 Press the SYSTEM CONTROL rotary knob for longer than 3 seconds

• The rotary knob lock is removed.
- The LOCKED LED is no longer lit.
- The rotary knob is in the basic LEVEL position.

Lock unit

8.11.3 Locking the complete unit

To lock the complete unit, proceed as follows:

Step Description

1 Press the SYSTEM CONTROL rotary knob at the same time as the OUT rotary knob for longer than 3 seconds

• The LOCKED LED is lit.
• The original settings are stored.
• Turning the rotary knob has no function.

- All other rotary knobs are in LEVEL mode and can still be operated.

Unlock unit

8.11.4 Unlocking the complete unit

To unlock the complete unit, proceed as follows:

Step Description

1 Press the SYSTEM CONTROL rotary knob at the same time as the OUT rotary knob for longer than 3 seconds

• The rotary knob lock is removed.
• The LOCKED LED is no longer lit.
- The rotary knobs are in the basic LEVEL position.

Unlock channels

8.11.5 Unlocking individual channels

To unlock individual channels, proceed as follows:

Step Description

1 Lock the complete unit, to do this press the SYSTEM CONTROL rotary knob at the same time as the OUT rotary knob for longer than 3 seconds

• The LOCKED LED is lit.
• The original settings are stored.
• Turning the rotary knob has no function.
• All other rotary knobs are in LEVEL mode and can still be operated.

2 Remove the lock on the required channel by pressing the rotary knob for the required channel for longer than 3 seconds

Lock channels

8.11.6 Locking individual channels

To lock individual channels, the complete unit is locked first and the lock is then removed for all channels that are not to be locked.

To lock individual channels, proceed as follows:

Step Description

1 Lock the complete unit, to do this press the SYSTEM CONTROL rotary knob at the same time as the OUT rotary knob for longer than 3 seconds

• The LOCKED LED is lit.
- The original settings are stored.
- Turning the rotary knob has no function.
- All other rotary knobs are in LEVEL mode and can still be operated.

2 Remove the lock on all channels by pressing the rotary knob for the required channels for longer than 3 seconds.

The status conditions that were set before the channels or the complete unit was locked, are retained even after the DMM8 U (UL, ULD) is switched of and back on!

8.12 Copying configuration data

The copy function can be used to copy individual or multiple settings (LEVEL, TREBLE, BASS, LOWCUT, LIMITER and COMPRESSOR) on an input to one or more other inputs.

Copy configurations

8.12.1 Copying individual values

To copy individual values from one channel to one or more other channels, proceed as follows:

Step Description

1 Select the required function on the SYSTEM CONTROL rotary knob

2 Press the rotary knob with the value to be copied, then straight away press the rotary knob up to which the copy process is to be carried out

3 Keep both rotary knobs pressed down (approx. 4 seconds) until an acoustic signal is sounded (beep) and the affected LED rings flash once briefly.

- Value was transmitted to the selected channels.

The copying process is applied to all rotary knobs that located between the two selected knobs.

8.12.2 Copying all values

To copy all values from one channel to one or more other channels, proceed as follows:

Step Description

1 Press the rotary knob with the values to be copied, then straight away press the rotary knob up to which the copy process is to be carried out

Step Description

2 Keep both rotary knobs pressed down (approx. 8 seconds) until an acoustic signal is sounded (beep beep) and the affected LED rings flash once briefly.

- Values were transmitted to the selected channels.

The copy process is possible in both directions (IN 1 to IN 6 and IN 6 to IN 1).

The following diagrams visualize the copy process.

Figure 53: Select rotary knobs (source)

Figure 54: Define copy range (target)

Figure 55: Keep the rotary knobs pressed down

Figure 56: Complete copy process

Reset to factory settings

8.13 Resetting the factory settings

To reset the factory settings for the entire device, proceed as follows:

Step Description

1 Switch on the device Wait until the start sequence of the automixer is complete (approx. 15 seconds).
2 Press the SYSTEM CONTROL rotary knob and keep pressed until step 5
3 Switch off the device at the mains
4 Switch the device back on after a short waiting time Wait until the start sequence of the automixer is complete (approx. 15 seconds).
5 Release the SYSTEM CONTROL rotary knob

- The device's factory settings have now been restored and a new system configuration can now be set up.

AUTOMIXING PRIORITY PAN / BALANCE COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED AQUANTES ROUTE TO REC ROUTE TO USB EQUALIZER LOW EQUALIZER HIGH PRESET SYSTEM CON

Figure 57: Resetting the factory settings

Resetting the factory settings deletes all of the stored settings!

9 Troubleshooting

WARNING: Risk of electric shock

There are unprotected contacts and cables within the unit that could cause serious injury from electric shock on contact.

- The unit is only permitted to be opened by authorized, qualified personnel for troubleshooting purposes.

PROBLEM POSSIBLE CAUSE REMEDY

No sound Power supply cable is not connected to unit	Connect power supply cable to unit
	Power switch off Turn power switch to on position
	Device is not connected to amplifier Connect output channel to amplifier
	Microphone or auxiliary equipment not connected to unit	Connect microphone or auxiliary device to unit
	Volume control set to minimum Turn up volume control
	Volume controls set to MUTE Cancel MUTE by pressing the rotary knob
	Pre-amplification not set correctly Set gain control on rear panel to correct pre-amplification
	Phantom power is switched off Switch on phantom power for condenser microphone
	External potentiometer set to minimum Turn up external potentiometer
No sound with sinusoidal feed	Automix algorithm suppressing constant signal	Exclude channel from automix algorithm

PROBLEM POSSIBLE CAUSE REMEDY

Distorted signal repro- duction

Pre-amplification not set correctly Set gain control on rear panel to correct pre-amplification

Volume control turned up too far Turn down volume

Input signal level too high Reduce input signal

If the error persists despite these instructions, contact AKG Acoustics GmbH or your AKG dealer immediately.

1 GÉNÉRALITÉS 135

8.11 Activer/Désactiver LOCKED 184

IN 1 IN 2 Off On

• Broche 1 = _|_
• Broche 2 = a
• Broche 3 = b

OUT L OUT R

L R REC (OUT)

L R REC (OUT) IN - EXPANSION - OUT RS232 USB

Illustration 10 : Extension

Simple line drawing of a room with two rooms and a floor, no text or symbols present

Illustration 12: Borne Phoenix

ON PEAK IN 2

• Level
• Treble
• Bass
• Low Cut
• Limiter
• Compressor
• Automixing
• Priority
• Pan / Balance
• Delay
• Routing To REC
• Routing To USB
• Equalizer Low
• Equalizer High
• Preset

off ON PEAK ON ON PEAK ROUTING TO REC

8.11 Activer/Désactiver LOCKED

Pure electrical circuit lines without any symbols

+

AUTOMIXING PRIORITY PAN / BALANCE COMPRESSOR LIMITER LOW CUT BASS TREBLE LEVEL LOCKED POANTE Route TO REC ROUTE TO USB EQUALIZER LOW EQUALIZER HIGH PRESET SYSTEM CON

Editor	AKG Acoustics GmbH	AKG ACOUSTICS, U.S.
	Laxenburger Straße 254	8500 Balboa Blvd. Dock 15
	1230 Viena	Northridge, CA 91329
	Austria	U.S.A.
	Tfno.: [phone]	Tfno.: [phone]
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Copyright	© 2015 AKG Acoustics GmbHTodos los derechos reservados.La información contenida en este manual de instrucciones, así como los dibujos y fotografías adjuntos, son propiedad intelectual de AKG Acoustics GmbH.En salvaguarda de los derechos de propiedad intelectual no deberá reproducirse ni comunicarse, total o parcialmente, esta documentación, con ningún fin, de ningún modo y por ningún medio, ya sea electrónico o mecánico, mediante fotocopia, grabación o sistemas de registro y reproducción de información, sin el permiso expreso por escrito de la empresa AKG Acoustics GmbH. Se prohíbe toda transmisión a terceros. Si así lo solicitamos, deberá devolvernos este manual.
FCC Statement	Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:Reorient or relocate the receiving antenna.Increase the separation between the equipment and receiver.Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.Consult the dealer or an experienced radio/TV technician for help.This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.Shielded cables and I/O cords must be used for this equipment to comply with the relevant FCC regulations. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment.
Actualización	Este manual puede ser objeto de modificaciones sin previo aviso, y no supone ninguna obligación para la empresa AKG Acoustics GmbH.
Versión 1.0
Fecha de publicación	Julio de 2015/Alemania

1 Generalidades

IN 1 IN 2 Off On

• Pin 1 = _
• Pin 2 = a
• Pin 3 = b

OUT L OUT R

L R REC (OUT)

L R REC (OUT) IN - EXPANSION - OUT RS232 USB

Simple line drawing of a room with two doors and a floor, no text or symbols present

Figura 12: Borne Phoenix

ON PEAK IN 2

Figura 16: Controles giratorios

• Level
• Treble
• Bass
• Low cut
• Limiter
• Compressor
• Automixing
• Priority
• Pan / Balance
• Delay
• Routing To REC
• Routing To USB

• Equalizer Low

• Equalizer High

• Preset

• Routing To Out
• Monitoring
• Mute

• Level
• Treble
• Bass
• Low cut
• Compressor
• Automixing
• Priority
• Pan
• Routing To Out
• Routing To Rec
• Routing To USB
• Monitoring
• Mute

• Level
• Treble
• Bass
• Limiter
  • Balance
• Delay
• Equalizer
• Monitoring
• Mute

off ON PEAK ON ON PEAK ROUTING TO REC