AT-DMM828 - Headphones Audio-Technica - Free user manual and instructions

Product Type	Over-ear, closed-back dynamic headphones
Brand	Audio-Technica
Model	AT-DMM828
Driver Type	Dynamic
Driver Diameter	45 mm
Frequency Response	10 Hz – 25,000 Hz
Impedance	32 ohms
Sound Pressure Level (Sensitivity)	98 dB/mW
Maximum Input Power	1,600 mW at 1 kHz
Cable Length	3.0 m (9.8 ft), straight
Connector	3.5 mm (1/8") stereo mini-plug, gold-plated
Weight (without cable)	290 g (10.2 oz)
Dimensions (folded)	190 x 90 x 210 mm (7.5 x 3.5 x 8.3 in)
Color	Black
Foldable Design	Yes, with swivel ear cups
Earpads	Soft memory foam with leatherette
Headband	Self-adjusting, padded
Included Accessories	6.3 mm (1/4") screw-on adapter, storage pouch
Warranty	2 years limited
Intended Use	Studio monitoring, critical listening, and home audio

Frequently Asked Questions - AT-DMM828 Audio-Technica

How do I connect the AT-DMM828 to my smartphone?

The headphones come with a 3.5 mm stereo plug. Simply plug into your smartphone's headphone jack. If your phone lacks a jack, use a Lightning or USB-C adapter (not included).

Are the ear cushions replaceable?

Yes, the earpads are detachable and can be replaced. Contact Audio-Technica support or authorized retailers for replacement parts.

What is the recommended way to clean the headphones?

Wipe the surfaces with a soft, dry cloth. Avoid solvents or abrasive cleaners. For the earpads, use a slightly damp cloth and let them air dry completely before use.

Do these headphones have active noise cancellation?

No, the AT-DMM828 are passive closed-back headphones. They provide natural noise isolation thanks to the closed-back design and well-padded ear cups.

Can I use the headphones with professional audio equipment?

Yes, the included 6.3 mm adapter allows connection to studio equipment, mixing consoles, and audio interfaces with that jack size.

What is the frequency response of the AT-DMM828?

The frequency response is 10 Hz to 25,000 Hz, offering extended bass and treble reproduction suitable for high-resolution audio.

How do I adjust the headband for a comfortable fit?

The headband is self-adjusting. Simply put the headphones on and it will automatically conform to your head size. For fine adjustment, you can gently bend the metal headband arms.

Is there a microphone on the headphones?

No, the AT-DMM828 are pure headphones for listening. They do not include a built-in microphone or inline controls.

What is the warranty period?

Audio-Technica provides a 2-year limited warranty against defects in materials and workmanship from the date of purchase. Keep your receipt.

Can these headphones be used for gaming?

Yes, they can be used for gaming thanks to their accurate sound reproduction and comfortable fit. However, they lack a microphone, so you will need a separate mic.

USER MANUAL AT-DMM828 Audio-Technica

AT-DMM828 Digital Matrix Mixer

Installation and Operation Ver.2

audio-technica DIGITAL GARTES MENU - AC#NANED

Installation and Operation

Warning:

To prevent fire or shock hazard, do not expose this apparatus to rain or moisture.

Caution:

To avoid electric shock, do not open the cabinet.

Refer servicing to qualified personnel only.

To prevent fire, do not place any naked flame sources (such as lighted candles) on this apparatus.

To prevent fire, do not cover the ventilation of this apparatus with newspapers, table-clothes, curtains, etc.

Do not expose this apparatus to drips or splashes.

Do not place any objects filled with liquids, such as vases, on this apparatus.

Do not install this apparatus in a confined space such as a bookcase or similar unit.

To install this apparatus only in the place where ventilation is good.

This apparatus should be located close enough to the AC outlet so that you can easily grasp the power cord plug at any time.

In case of emergency, disconnect the power cord plug of this apparatus quickly.

This apparatus with Class I construction shall be connected to the AC outlet with a protective grounding connection.

This apparatus is not disconnected from the mains as long as it is connected to the AC outlet, even if the unit itself has been turned off.

Important Safety Instructions

1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
8) Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.

10) Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

11) Only use attachments/accessories specified by the manufacturer.

12) Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/ apparatus combination to avoid injury from tip-over.

13) Unplug this apparatus during lightning storms or when unused for long periods of time.

14) Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN

AVIS RISQUE DE CHOC ÉLECTRIQUE NE PAS OUVRIR

To prevent electric shock, do not remove the cover. There are no user-serviceable parts inside. Internal adjustments are for qualified professionals only. Refer all servicing to qualified service personnel.

You are cautioned that any changes or modifications not expressly approved in this manual could void your authority to operate this equipment.

Warning for FCC

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.

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.

IC statement

CAN ICES-3 (B)/NMB-3(B)

About Power Cord

This model does not include AC power cord.

Therefore, you have to purchase it at your local store. You can confirm it at "Power Cord List".

Power Cord List

Power supply cord for 120 Vac power supply in U.S.A, Canada :

Approved by UL, CSA

Detachable, rated minimum 125 V, minimum 10 A, marked VW-1. Includes 3 x 18 AWG, Type SVT flexible cord. Minimum length 1.5 m.

One end terminates in a parallel blade, molded-on attachment plug rated 125 V, 10 A with a polarized NEMA 5-15P blade configuration.

Other end terminates in an appliance coupler.

Introduction

Please Note!

This manual assumes use of microphone-level inputs and line-level output for most typical SmartMixer applications. However, all inputs may be individually switched via the included AT-DMM828 Control Software to achieve any combination of mic-level and line-level inputs.

Signal flow can be changed via the included AT-DMM828 Control Software.

Refer to Software Manual for more information.

About the AT-DMM828

AT-DMM828 is a microprocessor-controlled, programmable, automatic-switching eight-channel matrix mixer. It can be used with low-impedance either dynamic or condenser microphones (including wireless microphone systems), as well as line-level sources.

AT-DMM828 is designed to improve audio quality in broadcast, sound-reinforcement and recording applications. One way it achieves this is by keeping the number of open microphones to minimum, thus reducing background noise, feedback and other distractions, while providing instant, completely transparent switching between channels.

Each of the eight balanced inputs provides switchable 48Volt phantom power; attenuation is also selectable on each input to allow use with line-level signals. The mixer's outputs are balanced and non-inverting. All audio connections terminate in block screw connectors.

Up to 16 units of AT-DMM828 (a total of 128 channels inputs) can be daisy-chained via CAT6 cable, which carries control bus, audio, and configuration data between mixers.

Multiple mixers linked in this way will operate as if they are a single mixer. Therefore, microphones activated on any mixer will cause the appropriate switching functions to occur. The link connectors are not compatible with LAN.

Each AT-DMM828 includes two separate external control system interfaces:

Individual channel contact closures (via DB25 connector) and PC control (via RS232 connector or USB). The RS232 connector can also be used to connect an external control system (e.g. Crestron ^® or AMX ^® ) using “open disclosure communication protocol” to control the mixer.

AT-DMM828 Features

- Eight balanced inputs allow to be used with either mic-level or line-level signal.

Each input provides:

- Smart Mixer V1 (Gating mode)

- Smart Mixer V2 (Gain Sharing mode)

*Supported by AT-DMM828 Ver.2 or later

- 48V phantom power (individually selectable)

- Individual gain and sound volume controls

- Gate attenuation adjustable (0 dB to full mute in steps of 1 dB)

- Gate hold time adjustable (0.1 sec to 6.0 sec in steps of 0.1 sec)

- Mic on threshold level adjustable (Auto/Manual)

- DSP algorithm

- Signal level meter (Peak/RMS)

- Signal generator (Sine wave/Pink noise/White noise) *input channel only

- Parametric EQ (3 band/4 band)

- Filter (Low pass/High pass/Low shelving/High shelving/Notch/All pass)

- Limiter

- Delay *output channel only

- 8×8 full matrix-mixing (can be extended to 128×8 matrix-mixing)

- Selectable NOMA (Number of Open Microphones Attenuated)

- Automatic gain adjustment as each microphone is activated

- Selectable manual mode overrides automatic functions

- Linking capability for up to 16 units (up to 128 inputs)

- Selectable external connector's pin assignment

- Gate status output (using for the Camera moving)*

- Gate On/Off/Toggle (using for input gate control by tactile switch)*

- Mute On/Off/Toggle (using for channel level control by tactile switch)*

• Volume Up/Down (using for channel level control by tactile switch)*

° VCA function (using for channel level control by external potentiometer)

*Positive/Negative selectable

- Compatible with Crestron ^ or AMX ^ systems

- All settings can be adjusted or modified through AT-DMM828 Control Software

- Mounts in a single U 19" rack space (EIA Standard)

Figure 1 – AT-DMM828 Front Panel Layout

1. USB connector

To connect PC using its own software to configure internal settings

2. Link status indicator

LED lights green when linked normally and red when the error occurred

3. Power "ON" indicator

4. Power Switch

1. Fan will automatically turn on when internal temperature exceeds 60^ C ( 140^ F).

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Figure 1

AT-DMM828 Rear Panel

Figure 2 – AT-DMM828 Rear Panel Layout

6. AC Inlet

100-240V AC, 50/60Hz, 25W

7. External Control Connector (25-pin D-Sub Female)

Provides external connection points to control AT-DMM828 using contact closures

8. Serial Data Connector (9-pin D-Sub Female))

RS232 data port allows PC to connect or as an interface port for Central Control System like Crestron ^® , AMX ^® or other brands' control systems using open communication protocols to configure internal mixer settings. RS232C and USB controls can be used simultaneously.

When changing parameters with both methods the last value will be stored.

9. Link In/Link Out connector (RJ-45)

Provides cascade connections of multiple mixers when more than eight microphones are used Use CAT6 cable. Maximum length is 0.5m.

NOTE: Use high quality CAT6 cable when linking mixers. Signal degradation will occur with low quality cable or connections resulting in communication errors between mixers.

10. Output Connectors (3-pin block screw connector)

Pin-1: Hot; Pin-2: Cold; Pin-3: Ground

Provides balanced mixing output

11. Input Connectors (3-pin block screw connector)

Pin-1: Hot; Pin-2: Cold; Pin-3: Ground

Provides balanced input

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Figure 2

Installation and Setup

Out of the box, the AT-DMM828 comes configured for most common applications.

Here are some basic setup tips to help quickly setup and running.

Installing the software

Computer requirements

To run the software, the following minimum computer hardware and software configuration are required.

Hardware:

Pentium processor running at 1.6 GHz or better

4 GB hard disk space recommended for application

1 GB RAM

9-pin RS232 Serial Data Port (Com Port) or USB interface

CD ROM Drive

Computer display capable of supporting at least 1024×768 pixel resolution

Operating System / Software:

Microsoft ^® Windows ^® XP SP3 and up including the following versions:

Windows Vista 32 bit version *Only supported by AT-DMM828 Ver. 1

Windows Vista 64 bit version

Windows 7 32 bit version

Windows 7 64 bit version

Windows 8 32 bit version

Windows 8 64 bit version

Note: This software will not run on LINUX ^® or Mac OS based system.

Note: This software requires Microsoft. NET Framework 4 Client Profile. If the computer does not have. NET Framework 4 Client Profile installed, the installation process will ask to install it during setup. After installation process finishes, it will ask to restart the computer.

Installing the software

Note: It must have administrator rights for the computer to install the software.

1. Close all running applications

2. Insert the AT-DMM828 Software CR ROM into the computer's CD ROM drive Use "Browse" to locate the setup file on the CD ROM

3. When "Setup" is executed, the Setup welcome dialog box appears

4. Click OK to begin setup Wizard

Connecting the AT-DMM828 to the computer

Connect a standard 9-pin RS232 type data cable (or USB cable) between the computer and the RS232 port on the back panel (the USB port on the front panel) of the AT-DMM828. If multiple AT-DMM828s are linked together, connect the data cable to the master unit in the linked chain.

Gain Sharing Mode

Gain sharing functionality requires a looped connection with a dedicated cable.

Slave#2 SLAVE#1 Master Dedicated cable

Turn off the power before connecting the Link cable. When using the link functionality, be certain that all linked mixers are ON.

Gate Mode

Slave#2 Slave#1 Master

Set the master unit to the bottom and connect to upper slave units.

Main Window

AT-OMM320 [Offline] File Edit Setup Window Image/Text About Operation Block Master Input Max Outputs ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ Preset 1 2 3 4 5 6 Scale Unit 0

1. Menu Bar

File: To save and to open files and it can also print the window

Edit: To copy and to paste operation blocks and it can also insert images and texts

Setup: To set window parameters settings window, the software settings window and communication settings window and it can restore mixer to factory default settings

Window: To select the open windows

Image/Text: To select inserted images and texts

About: To check software version and firmware version

1. Online/Offline Indicator: Indicator will change to orange color when PC and AT-DMM828 are connected, and Communications Settings window can be displayed by double-click this indicator

2. Operations Block: To adjust the internal block of the mixer by dragging and dropping these blocks (Refer to "Customizing the DSP block" & Operations Blocks' Descriptions)

3. Preset: maximum of 10 presets' data can be saved in PC. Yellow icon indicates it has already got preset data

Right-click either yellow or gray icon to save current setting

Preset Save Preset Number 1 Test 1 Save Cancel AT-DMM828 ? Preset1 Save OK? Yes No

Left-click the yellow icon to load the preset data

Please perform the following operations to access the preset file.

Go to Start Menu → Audio-Technica Corp → AT-DMM828 → Preset (Short cut icon)

1. Scale: Can adjust the scale of the main block by sliding the button

1. Unit: To select the unit to display its DSP usage

2. DSP Resource Monitor: To display each unit DSP processing usage

3. Orange color: Input block processing usage

4. Light Blue color: Output block processing usage

5. External Settings: Double-click this icon to display External Control Terminal Settings window

6. Input Channel Settings: Double-click this icon to display Input channel settings window
7. Matrix Mixer Settings: Double-click this icon to display Matrix mixer settings window
8. Output Channel Settings: Double-click this icon to display Output channel settings window

Parameter Settings Link Unit 1 SET NOMA OFF Last Mic. ON Open Ch Disabled 1 Chairman Disabled Ch 1 AutoMix Mode Gate Priority mode Mode 1 Hold Time 1.0 sec. Baud rate 38400 bps Threshold Parameter Setting Threshold k 1.20 Threshold Max -10.0 dB Threshold Min -40.0 dB Correlation Coefficient 0.50 GainShare Threshold -50.0 dB

1. Link Unit: Select the number of the system unit; change the number and click the "Set" button
2. NOMA: Set number of Open Microphones Attenuated (NOMA) On/Off
3. Last Mic: Select the Last Mic On/Off.

- In any of the modes of operation, the last microphone "ON" will remain "ON" when talking ceases, to provide continuous room ambience

1. OpenCh: Set the maximum number of channel openings from 1 to 16; select "Disable", the number of channel openings is not restricted
2. Chairman: When the channel set as the chairperson becomes open, other channels are closed compulsorily

- The number means that Master's channel 1 is "1" and channel 2 is "2". Slave#1's channel 1 is "9" and channel 2 is "10"... Slave#15's channel 8 is "128"

1. AutoMix Mode:

2. Gate: Auto Mixing is achieved through noise gates allowing only active channels to go through and muting inactive channels.

3. Gain Share: Auto Mixing is achieved by sharing the gain between the active channels. The total gain of the system remains constant. *In Gain Sharing mode, mute unused channels.

4. Priority mode: This mixer has two priority modes

The maximum gate open number limits the number of open channels over the system

• Mode 1: The channel to which the priority was set also receives restriction of the number of the maximum channels

• Mode 2: The channel to which the priority was set does not receive restriction of the number of the maximum channels

• HoldTime: Select the gate hold time 0.1 to 6.0 sec (0.1 sec stepping)

• Baudrate: It is a baud rate of a mixer, and it can change the baud rate in the online mode. A preset value is reflected after a mixer reboots; 38400, 57600, & 115200 bps
• Threshold K: Auto threshold sensitivity. A higher value will make it more difficult to trigger the gate open. Range is 1.00 to 3.00 (0.01 stepping)

• Threshold Max: The maximum dB that will trigger a gate to open. Reducing the possibility of transient sounds false triggering the gate. Range is -80 to 0dB (0.1 stepping)

• Threshold Min: The minimum dB that will trigger a gate to open. Reducing the possibility of gates closing and interrupting active dialogue. Range is -80 to 0dB (0.1 stepping)

• Correlation Coefficient: This value adjust the calculations used to determine if multiple channels are receiving the same source. A higher value will make it more likely for multiple microphones to pass the same source. This value is factory set and in most cases should remain at the default level of 0.50. Range is 0.01 to 1.00 (0.01 stepping)
• GainShare Threshold: This level should be set so the open microphones triggers the camera control.

Suggestions for using multiple microphones: Proper adjustment of the Threshold K for background noise and other non-intended audio will ensure best operation of the auto-mixer.

Adjusting Threshold K: This level should be set to the ambient noise of the room (Computer fans, video projector fans, HVAC, etc.) so as not to trigger the gain reduction.

With two people speaking into two microphones adjust the Threshold K until the gain reduction activates and stays on during short pauses in speech. This value should be increased in high ambient noise applications.

Adjusting Threshold Maximum: This controls false triggers of the automatic gate regardless of the microphone channel gain setting. Setting this level too low can cause transient sounds such as coughs or table pounds to trigger a gate.

Adjusting Threshold Minimum: will help control false triggers of the automatic gate regardless of the microphone channel gain setting. Setting this level too high can cause the gate to cut off words.

NOMA or Number of Open Microphones Attenuator utilizes audio thresholds to manage a shared total gain. As more microphone channels are opened, the gain of each channel is attenuated to achieve the same total output level regardless of the amount of microphone gates open.

There are the limits of this automix method. When using more than 10 channels the NOMA setting may not be achievable in "Auto-Mode". Directions for using a manual mode and optimizing each channel individually can be found on (P.19).

*These functions are disable in gain share mode. No. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13.

Software Settings Language Select Language English Language settings will take effect after restart. Rendering Option Software rendering Take effect after a restart.

Software Settings Language Select Language Language settings will take a restart. Rendering Option Software rendering Take effect after a resta English English Deutsch español français italiano 日本語 한국어 Nederlands Portugues русский 中文(简体) 中文(繁體)

1. Language: Select the language that will display
   a. Language available: English, German, Spanish, French, Italian, Japanese, Korean, Dutch, Portuguese, Russian, Traditional Chinese, Simplify Chinese
2. Software rendering: Number of Open Microphones Attenuated (NOMA) is set

Communications Settings

Communication Settings Serial Communication Speed 38400 bps Port COM1 Connect Disconnected USB Communication Connect Disconnected

Communication Settings Serial Communication Speed 38400 bps Port COM1 Connect Disconnected USB Communication Connect Connected

1. Serial Communication Speed: Adjustable range is 38400 to 115200 bps *It is necessary to make it the same value as the baud rate of parameter setup

2. Port: The port where the mixer connect/disconnect to the PC

3. Serial Connect button: The mixer is connected or disconnected to the PC via serial port

4. USB Connect button: Select connect or disconnect to the PC using USB interface
5. Progressive Bar: The progress of connection will be displayed

RS232 Control Port

A rear panel RS232 port (9-Pin) is provided to allow for the connection of a computer running the AT-DMM828 Control Software application or external control system (Crestron ^® or AMX ^® ) is using open disclosure communications protocol.

Customize the DSP block

Adjust the internal block of this mixer in offline mode

A block which you want to add is chosen from an operation block area and it dragging and dropping on the line of a channel.

AT-DMM328 [Offline] File Edit Setup Window Image/Text About Offline Operation Block It can drop, if a line changes to pink. Master

The number of the blocks which can be arranged to each channel has restriction.

graph TD
    A["Input Data"] --> B["M"]
    A --> C["Y"]
    A --> D["Z"]
    B --> E["M"]
    C --> F["Y"]
    D --> G["Z"]
    E --> H["Output"]
    F --> H
    G --> H
    H --> I["V"]
    H --> J["W"]
    H --> K["N"]

The delay block can arrange only to output side.

3 Band Equalizer Settings

Double-click "Equalizer" block, 3 Band EQ will display the following window

Equalizer Settings Unit: Master Channel No. 1 Band 1 Bell Frequency (Hz) 100 Gain (dB) -20.0 Quality Bandwidth (oct) 1.55 Bypass ① ② ③ ④ ⑤ ⑥ ⑦ 83 10 25 40 60 80 125 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 1050 1100 1150 1200 1250 1300 1350 1400 1450 1500 1550 1600 1650 1700 1750 1800 1850 1900 1950 2000 ⑧ ⑨

1. Unit name and Channel No: The unit name and channel number to which this block is set will be displayed
2. Band: Click and select the band to adjust;

• 3 band EQ has Band 1 (100 Hz), Band 2 (500 Hz) and Band 3 (2500 Hz)

Equalizer Settings Unit: Master Channel No. 1 Band 1 Band 2 Band 3 Frequency (Hz) 100 Gain (dt) -20.0 Quality Bandwidth (act) 1.55 Bypass

1. Equalizer type: Click and select the equalizer type;

2. Low Shelving
   • High Shelving

3. Notch
4. Bell (default)

Equalizer Settings Unit: Master Channel No. 1 Band 1 Bell Low Shelving High Shelving Notch Bell Gain (dB) -20.0 Quality Bandwidth (oct) 1.55 Bypass

1. Frequency: To select the center frequency (Hz) for the current band; range is from 20 Hz to 20 kHz (1 Hz stepping)
2. Gain: To adjust the amount of boost or cut applied at the center frequency for the current band from 9 to -27 dB (0.1 dB stepping); default at 0 dB
3. Quality: Q or Quality factor, selects the ratio of the center frequency divided by the bandwidth. Q reflects an inverse relationship to the bandwidth, and adjust from 0.01 to 50.00 (0.01 stepping); default at 0.50
4. Bypass: When selected, it will bypass this filter
5. Quality dot: Q factor dot
6. Frequency square: These settings may be adjusted by dragging the band controls shown inside the graph

4 Band Equalizer Settings

Double-click "Equalizer" block, 4 Band EQ will display the following window

Equalizer Settings Unit: Master Channel No. 2 Band 1 Bell Frequency (Hz) 80 Gain (dB) 5.0 Quality Bandwidth (oct) 0.80 Bypass 20 31.5 50 63 100 160 250 315 500 630 1K 1.6K 2.5K 3.15K 4K 6.2K 10K 16K 9 ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨

1. Unit name and Channel No: The unit name and channel number to which this block is set will be displayed
2. Band: Click and select the band to adjust;

• 4 Band EQ has Band 1 (80 Hz), Band 2 (315 Hz), Band 3 (1250 Hz) and Band 4 (5000 Hz)

Equizer Settings Unit: Master Channel No. 2 Band 1 Band 2 Band 3 Band 4 80 Gain (dB) 5.0 Quality Bandwidth (act) 0.80 Bypass

1. Equalizer type: Click and select the equalizer type;

2. Low Shelving
   • High Shelving

3. Notch
4. Bell (default)

Equilizer Settings Unit: Master Channel No. 2 Band 1 Bell Low Shelving High Shelving Notch Bell Gain (dB) 5.0 Quality Bandwidth (act) 0.89 Bypass

1. Frequency: To select the center frequency (Hz) for the current band; range is from 20 Hz to 20 kHz (1 Hz stepping)
2. Gain: To adjust the amount of boost or cut applied at the center frequency for the current band from 9 to -27 dB (0.1 dB stepping); default at 0 dB
3. Quality: Q or Quality factor, selects the ratio of the center frequency divided by the bandwidth. Q reflects an inverse relationship to the bandwidth, and adjust from 0.01 to 50.00 (0.01 stepping); default at 0.50
4. Bypass: When selected, it will bypass this filter
5. Quality dot: Q factor dot
6. Frequency square: These settings may be adjusted by dragging the band controls shown inside the graph

All Pass Filter Setting

Double-click "All Pass Filter" block, the following window will be displayed

Filter Settings Unit: Master Channel No. 2 All Pass Frequency (Hz) 1000 Gain (dB) 0.0 Quality Bandwidth (oct) 1.60 0.89 Bypass

1. Unit name and Channel No: The unit name and channel number to which this block is set will be displayed
2. Filter Type: Click to change to other filter type

3. Frequency: Adjust the center frequency from 20 Hz to 20 kHz (1 Hz stepping)

4. Gain: Fixed at 0 dB (non-adjustable)

5. Quality/Bandwidth: Adjust the quality of the filter; Q from 0.20 to 4 (0.01 stepping), default at 0.5; bandwidth (oct) from 4.74 to 0.36 (0.01 stepping), default at 2.55
6. Bypass: When selected, it will bypass this filter

Notch Filter Setting

Double-click "Notch Filter" block, the following window will be displayed

Filter Settings Unit: Master Channel No. 2 ① ② Notch Frequency (Hz) 1000 Gain (dB) 0.0 Quality Bandwidth (oct) 0.50 Bypass 20 31.5 50 80 125 200 315 500 800 1.25K 2K 3.15K 5K 8K 12.5K 20K -9 6 9 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 79 82 85 88 91 94 97 100 103 106 109 112 115 118 121 124 127 130 133 136 139 142 145 148 151 154 157 160 163 166 169 172 175 178 181 184 187 190 193 196 199 202 205 208 211 214 217 220 223 226 229 232 235 238 241 244 247 250 253 256 259 262 265 268 271 274 277 280

1. Unit name and Channel No: The unit name and channel number to which this block is set will be displayed
2. Filter Type: Click to change to other filter type

3. Frequency: Adjust the center frequency from 20 Hz to 20 kHz (1 Hz stepping)

4. Gain: Fixed at 0 dB (non-adjustable)

5. Quality: Adjust the quality of the filter; Q from 0.01 to 50.00 (0.01 stepping); default at 0.50
6. Bypass: When selected, it will bypass this filter

Low Pass Filter Setting, -12 dB/oct

Double-click "Low Pass Filter" block, the following window will be displayed

Filter Settings Unit: Master Channel No. 4 Low pass (-12dB/oct) Frequency (Hz) 1000 Gain (dB) -3.0 Quality Bandwidth (oct) 0.71 Bypass

1. Unit name and Channel No: The unit name and channel number to which this block is set will be displayed
2. Filter Type: Click to change to other filter type

3. Frequency: Adjust the cut-off frequency from 20 Hz to 20 kHz (1 Hz stepping)

4. Gain: Fixed at -3 dB (non-adjustable)

5. Quality: Fixed at 0.71 (non-adjustable)
6. Bypass: When selected, it will bypass this filter

● High Pass Filter Setting, -12 dB/oct

Double-click "High Pass Filter" block, the following window will be displayed

Filter Settings Unit: Master Channel No. 4 High pass (-12dB/oct) Frequency (Hz) 1000 Gain (dB) -3.0 Quality Bandwidth (oct) 0.71 Bypass

1. Unit name and Channel No: The unit name and channel number to which this block is set will be displayed
2. Filter Type: Click to change to other filter type

3. Frequency: Adjust the cut-off frequency from 20 Hz to 20 kHz (1 Hz stepping)

4. Gain: Fixed at -3 dB (non-adjustable)

5. Quality: Fixed at 0.71 (non-adjustable)
6. Bypass: When selected, it will bypass this filter

Low Pass Filter Setting, -6 dB/oct

Double-click "Low Pass Filter" block, the following window will be displayed -6dB

Filter Settings Unit: Master Channel No. 5 Low pass (-6dB/oct) Frequency (Hz) 1000 Gain (dB) -3.0 Quality Bandwidth (oct) 0.71 Bypass

1. Unit name and Channel No: The unit name and channel number to which this block is set will be displayed
2. Filter Type: Click to change to other filter type

3. Frequency: Adjust the cut-off frequency from 20 Hz to 20 kHz (1 Hz stepping)

4. Gain: Fixed at -3 dB (non-adjustable)

5. Quality: Fixed at 0.71 (non-adjustable)
6. Bypass: When selected, it will bypass this filter

● High Pass Filter Setting, -6 dB/oct

Double-click "High Pass Filter" block, the following window will be displayed

Filter Settings Unit: Master Channel No. 5 High pass (-6dB/oct) Frequency (Hz) 1000 Gain (dB) -3.0 Quality Bandwidth (oct) 0.71 Bypass

1. Unit name and Channel No: The unit name and channel number to which this block is set will be displayed
2. Filter Type: Click to change to other filter type

3. Frequency: Adjust the cut-off frequency from 20 Hz to 20 kHz (1 Hz stepping)

4. Gain: Fixed at -3 dB (non-adjustable)

5. Quality: Fixed at 0.71 (non-adjustable)
6. Bypass: When selected, it will bypass this filter

Low Shelving Filter Setting

Double-click "Low Shelving Filter" block, the following window will be displayed

Filter Settings Unit: Master Channel No. 6 Low Shelving Frequency (Hz) 1000 Gain (dB) -3.0 Quality Bandwidth (oct) 0.71 Bypass

1. Unit name and Channel No: The unit name and channel number to which this block is set will be displayed
2. Filter Type: Click to change to other filter type

3. Frequency: Adjust the cut-off frequency from 20 Hz to 20 kHz (1 Hz stepping)

4. Gain: Adjust the amount of cut or boost applied by the filter; gain at 9 dB to -27 dB (0.1 dB stepping)

5. Quality: Adjust the quality of the band; Q from 0.01 to 1.00 (0.01 stepping)
6. Bypass: When selected, it will bypass this filter

● High Shelving Filter Setting

Double-click "High Shelving Filter" block, the following window will be displayed

Filter Settings Unit: Master Channel No. 5 High Shelving Frequency (Hz) 1000 Gain (dB) 6.0 Quality Bandwidth (oct) 0.71 Bypass

1. Unit name and Channel No: The unit name and channel number to which this block is set will be displayed
2. Filter Type: Click to change to other filter type

3. Frequency: Adjust the center frequency from 20 Hz to 20 kHz (1 Hz stepping)

4. Gain: Adjust the amount of cut or boost applied by the filter; gain at 9 dB to -27 dB (0.1 dB stepping); default at -3.0 dB

5. Quality: Adjust the quality of the filter, Q from 0.01 to 50.00 (0.01 stepping); default at 0.71
6. Bypass: When selected, it will bypass this filter

Limiter Setting

Double-click "Limiter" block, the following window will be displayed

Limiter Settings Unit: Master Channel No. 1 Attack time (ms) 100 Release time (ms) 200 Active Ratio (N:1) N = 2.0 Threshold (dB) -10.0 Bypass Output Level (dB) Input Level (dB)

1. Attack time: Determines how quickly the limiter reacts to input level changes

- Adjustable range is 0 to 2000 ms (1 ms stepping)

1. Release time: Determines how quickly gain reduction is released, once input signal falls below threshold.

- Adjustable range is 0 to 2000 ms (1 ms stepping)

1. Active LED: Indicates the activity of gain reduction

- When the input level reaches the threshold level, the active LED turns on.

- When the input level drops below the threshold level, the active LED is turned off at the defined release time.

- If the input level reaches the threshold again during the release time, the active LED stays on.

1. Ratio: Determines the intensity of gain reduction

- Adjustable range is 1:1 to 20:1 (0.1 stepping)

1. Threshold: Determines what input level will trigger gain reduction

- Adjustable range is -80 to 0 dB (0.1 dB stepping)

1. Bypass button: Disables the limiter without changing settings

Delay Setting

Double-click "Delay" block, the following window will be displayed

Delay Setting Unit: Master Channel No. 1 DelayTime (ms) 90 Bypass

1. Delay Time: Determines the amount of delay

- Adjustable range is 0 to 300ms (1 ms stepping)

1. Bypass button: Disables the delay without changing settings

Orange color Input usage; Light Blue color Output usage

Input usage; Light Blue color Output usage Unit 0

Unit 0, Master Unit, Selection and its DSP Resource Usage Display

Unit 1 File Edit Selection Tools Help Operation Back Window Help Form 1 F O S T U V W X Y Z Balance M M N ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M M ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M H ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I ✓ M I

Unit 1, Slave Unit 1, Selection and its DSP Resource Usage Display

Double-click

or

"SlaveX" icon to load and display the External Control Terminal Settings window

It must be in Offline mode to perform settings

1. Enable/disable external control
2. Drop-down menu

Mute - ON / OFF / Toggle

Volume - +3.0 to -3.0

(1 dB stepping)

Gate - ON / OFF / Toggle VCA

Output - Positive/Negative

External Control Terminal Settings Unit: Master 1 ON ON ON ON Output Hulse Volume Culse U23 Output Input 6 Input 7 Input 8 Hulse Input 1 Input 2 Input 3 Input 4 Input 5 Input 6 Input 7 Input 8 Output 1 Output 2 Output 3 Output 4 Output 5 Output 6 Output 7 Output 8 Hulse ON OFF Toggle Volume Input 1 Input 2 Input 3 Input 4 Input 5 Input 6 Input 7 Input 8 Output 1 Output 2 Output 3 Output 4 Output 5 Output 6 Output 7 Output 8 Gain Control OFF ON +2.0 +3.0 +2.0 +1.0 0.0 1.0 0.0 3.0

The following table show what functions is available for each pin assignment:

PIN

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

Mute

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

VolumeX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

GateX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

VCA

X

X

X

X

X

X

X

X

OutputX

X

X

X

X

X

X

X

External Control Connector (25-Pin D-Sub)

To increase the integration flexibility of the AT-DMM828 with external control and indicator devices, a rear panel connector (25-pin) is provide.

Pin#	Selectable Function	Pin#	Selectable Function
1	Channel status output or Gate on/off/toggle or Mute on/off/toggle or Volume up/down	2	Channel status output or Gate on/off/toggle or Mute on/off/toggle or Volume up/down
3	Channel status output or Gate on/off/toggle or Mute on/off/toggle or Volume up/down	4	Channel status output or Gate on/off/toggle or Mute on/off/toggle or Volume up/down
5	Channel status output or Gate on/off/toggle or Mute on/off/toggle or Volume up/down	6	Channel status output or Gate on/off/toggle or Mute on/off/toggle or Volume up/down
7	Channel status output or Gate on/off/toggle or Mute on/off/toggle or Volume up/down	8	Channel status output or Gate on/off/toggle or Mute on/off/toggle or Volume up/down
9	Gate on/off/toggle or Mute on/off/toggle or Volume up/down	10	Gate on/off/toggle or Mute on/off/toggle or Volume up/down
11	Gate on/off/toggle or Mute on/off/toggle or Volume up/down	12	Gate on/off/toggle or Mute on/off/toggle or Volume up/down
13	Gate on/off/toggle or Mute on/off/toggle or Volume up/down	14	Gate on/off/toggle or Mute on/off/toggle or Volume up/down
15	Gate on/off/toggle or Mute on/off/toggle or Volume up/down	16	VCA control or Gate on/off/toggle or Mute on/off/toggle or Volume up/down
17	VCA control or Gate on/off/toggle or Mute on/off/toggle or Volume up/down	18	VCA control or Gate on/off/toggle or Mute on/off/toggle or Volume up/down
19	VCA control or Gate on/off/toggle or Mute on/off/toggle or Volume up/down	20	VCA control or Gate on/off/toggle or Mute on/off/toggle or Volume up/down
21	VCA control or Gate on/off/toggle or Mute on/off/toggle or Volume up/down	22	VCA control or Gate on/off/toggle or Mute on/off/toggle or Volume up/down
23	VCA control or Gate on/off/toggle or Mute on/off/toggle or Volume up/down	24	+3.3V (for VCA control)
25	GND

To activate mute-on/mute-off, volume-up/volume-down and gate-on/gate-off, install a closure between the appropriate pin and +3.3V Reference on the External Control connector (24pin) on back of unit.

Double-click "Inputs" block, the following window will be displayed

Input Channel Settings Unit: Master Gate control mode Auto Correlation Invalid Level Meter RMS CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 -80.0 12.70 -80.0 12.70 -80.0 12.70 -80.0 12.70 -80.0 12.70 -80.0 12.70 -80.0 12.70 Pre Mute OFF Pre Mute OFF Pre Mute OFF Pre Mute OFF Pre Mute OFF Pre Mute OFF Pre Mute OFF MIC 48V OFF MIC 48V OFF MIC 48V OFF MIC 48V OFF MIC 48V OFF MIC 48V OFF MIC 48V OFF Audio input Audio input Audio input Audio input Audio input Audio input Audio input Audio input Gate status Gate status Gate status Gate status Gate status Gate status Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed Closed

1. Gate control mode: To select Auto or Manual mode
2. Correlation: To select Valid or Invalid Correlation of an input signal is judged and gate control of a contiguity channel is performed A judgment is performed in each unit
3. Input level meter response: To select RMS or PEAK metering
4. Channel name: To edit, double click the name and edit *channel name are not stored in the mixer.
5. Gain: Adjustable range is 12.7 to 52.7 dB (32 steps logarithmic scale)
6. Volume: Adjustable range is -80 to 0 dB (0.1 dB stepping)
7. Pre/Pos: Select Input level meter response in pre-fader or post-fader.
8. Mute button: To mute each input channel

9. Input Attenuator and Phantom Power: Select either MIC or LINE. LINE is already attenuated 30 dB Select the phantom power (+48V) ON/OFF

10. Input source: To select input source Audio input or White noise /Pink noise /Tone (for channel calibration)

11. Gate status: The gate status of the channel is indicated
12. Force-On/OFF button: To force the gate open or closed via software.
13. Gate priority: Set priority to each channel
14. Auto Target: To select ON or OFF mode, the channel which is set "Auto Target" – "ON" mode: it becomes the calculation target for the gate threshold in Auto mode
15. Gate Threshold: Adjustable range is -80 to 0 dB in Manual mode (0.1 dB stepping)
16. Gate Attenuation: Set attenuation level for Mic-Off; adjustable range is -80 to 0 dB (0.1 dB stepping)

*These functions are disable in gain share mode. No.1, 2, 12, 13, 14, 15, 16.

Double-click "Mixer" block, the following window will be displayed

Matrix Mixer Settings Master Outputs 1 2 3 4 5 6 7 8 Connect all Disconnect all Diagonal Copy ① Master Inputs 1 2 3 4 5 6 7 8

1. Matrix Figure: Right-click on the point, to select the matrix connect or disconnect Green color represents connection; pink color represents no connection Left-click on one of the squares, to adjust the sending level on the matrix Sending level range is -80 to 0 dB (0.1 dB stepping) When lower the sending level, the color of the squares will lighten gradually to white color at 0 dB

Matrix Mixer Settings Marker Outputs Connect all Disconnect all Diagonal Copy 0.0 Matrix Mixer Settings Marker Outputs Connect all Disconnect all Diagonal Copy -43.1 80

1. There are 4 select buttons next to the Master Matrix block

a. Connect all: when click on this button, all input channels are connected to all output channels

Matrix Mixer Settings Matrix Outputs Connect all Disconnect all Diagonal Copy

b. Disconnect all: when click on this button, all input channels are disconnected to all output channels; there is no output

Matrix Mixer Settings Matrix Outputs Connect all Disconnect all Diagonal Copy

c. Diagonal: when click on this button, each input channel is only connect to one respective output channel

Matrix Mixer Settings Motor Outputs Connect all Disconnect all Diagonal Copy

d. Copy: this button is for 2 or more units linking together

- when 2 or more units, the Matrix Mixer Settings window will have additional matrix block that mark as Slave input block linking to Master outputs, as show below

Matrix Mixer Settings Mixer Options Connect all Disconnect all Dropout Copy Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Options Mixer Types

- Click the Copy button, the following window will display to allow selection any of the connecting unit copy to other connecting unit within the linking system

Matrix Copy Master Slave1 Slave2 Slave3 Slave4 Slave5 Slave6 Slave7 Slave8 Slave9 Slave10 Slave11 Slave12 Slave13 Slave14 Slave15 Master Slave1 Slave2 Slave3 Slave4 Slave5 Slave6 Slave7 Slave8 Slave9 Slave10 Slave11 Slave12 Slave13 Slave14 Slave15 OK Cancel

- Click the Slave Output bar will display the output connection within its own slave unit and from the slave unit or units connecting below

Mapx Minor Settings Connect all Unconnect all Disginal Copy Mapx Minor Settings 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 1 2 3 4 5 6 7 8 1 1 2 3 4 5 6 7 8 1 1 2 3 4 5 6 7 8 1 1 2 3 4 5 6 7 8 1 1 2 3 4 5 6 7 8 1 1 2 3 4 5 1 1 2 3 1 1 1 1

Double-click "Outputs" block, the following window will be displayed

1. Output level meter response: To select the RMS or PEAK metering

2. Channel name: To edit, double click the name and edit

3. Volume: Adjustable range is -80 to 0 dB (0.1 dB stepping)

4. Mute button: To mute each output channel

When 2 or more units linking together, the Main Window will display as follow:

AT-DMM828 [Online] File Edit Setup Window Image/Text About Online Operation Block M M — P Preset 1 2 3 4 5 6 7 8 9 10 Scale — Unit 0 Host Host Host

AT-DMM828 Quick Setup Tips

1. Connect a microphone to input and connect the other equipment (amplifier-speaker etc...) to output
2. Connect the power cord to the mixer and plug it to an AC outlet
3. Connect the USB cable to the mixer and PC
4. Turn Power Switch "ON"
5. Start the AT-DMM828 Control Software
6. Select "File" > "Open" > "DEMO.dmm828" Then the default block setting will be displayed
7. Select "Setup" > "Communication Settings" or Double-clicking "Offline" icon

AT-DMM328 [Offline] File Edit Setup Window Image/Text About Offline Parameter Settings Software Settings Communication Settings Password Settings Restore to Factory Settings

The following window show up

Communication Settings Serial Communication Speed 3840% fps Port COM1 Connect Unconnected USB Communication Connect Unconnected

1. Click the "USB Communication's Connect" button The following either one of the 2 dialogs will come up, select "Yes" button

- A setup will be reflected in a mixer, if it shifts to online mode after arranging an operation block.

- The following dialog is displayed when only a parameter is different by the case where the composition of the present mixer is the same as that of PC application.

AT-CMM528 Link configuration data has modified. Do you want to re-configure the miner? Yes No Cancel

• If "YES" is chosen, a setup of PC application will be overwritten by the mixer.
• If "NO" is chosen, a setup of the present mixer will be read on PC application.
• When the number of connected mixers is greater than the number stored in the settings, the following dialog appears.

AT-DMM828 There are more mixers than the number stored in the settings. Gain sharing function will not be available. Do you want to continue? Yes No

- When the number of connected mixers is smaller than the number stored in the settings, the following dialog appears.

AT-DMM828 The number of connected mixers is smaller than the number stored in the settings. Do you want to continue? Yes No

- When the loop connection is not present, the following dialog appears.

AT-DMM828 There is no loop connection. Gain sharing function will not be available. Do you want to continue? Yes No

"Offline" icon will change "Online" icon if it connects normally

AT-DMM826 [Online] File Edit Setup Window Image/Text About Online Operation Block

1. Double-click "Inputs" block, the input setting window will be displayed

C100 C200

Input Channel Settings CHI Gate control mode Auto Correlation Struck Level Name RMS 40.0 12.76 Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain Volume Gain

1. Set the input volume, gain level and phantom power
2. Double-click "Outputs" block, the output setting window will be displayed

1. Set output level

* EQ or Filters and some additional blocks can be added in offline mode. (Refer to "Customize the DSP block")

Specifications

Input Impedance Balanced
Mic 6600 ohms
Line 8500 ohms
Output Impedance Balanced 200 ohms
Gain Range 12.7 to 52.7 dB 32 steps logarithmic scale
Mic/Line Input Attenuation 30 dB
Maximum Input Level Balanced, THD+N at 1 %
Mic -40 dBu (-42.2 dBV) Gain at Max
-2.5 dBu (-4.71 dBV) Gain at Min
Line -10 dBu (-12.2 dBV) Gain at Max
	+26.5 dBu (+24.2 dBV)	Gain at Min
Maximum Output Level	+24 dBu (+21.8 dBV)	Balanced, THD+N at 1%
Maximum Gain	+64 dB	Balanced-in to balanced-out
THD+N less than 0.05%	20 to 22,000 Hz BW filter +4 dBu signal, unity gain
Dynamic Range	102 dB	A-weighted, referenced +24 dBu, Rs = 150 ohm input
Frequency Response	20 to 20,000 Hz	±3 dBr referenced at 1k Hz
Equivalent Input Noise	-112.8 dBu (-115 dBV)	Gain at Max A-weighted, Rs = 150 ohm input
Maximum NOMA Attenuation	=20 dB (up to 100 mics on simultaneously)
Microphone Phantom Power	+48V DC ±2V DC
Control Voltage Out	+3.3V DC
Latency	1ms	Propagation delay from input to output
Power Supply	100-240V AC, 50/60 Hz, 25W
Operating Temperature	0° to 40°C (32° to 104°F)
Dimensions	482 x 230 x 44 mm (19 x 9.05 x 1.75") W x D x H(Not including feet, knobs and connectors)
Weight	2.4 kg (5 lbs. 4.5 oz.)
Accessories Included	AC power cord
DIGITAL
SAMPLE RATE	48 kHz
QUANTIZATION	24-bit Delta-sigma ADC and DAC
DIGITAL PROCESSING	Uses two TI TMS320TM DSP
DSP CPU Speed Range	266 MHz