HPA 4000 - Headphone amplifier AKG - Free user manual and instructions

Product Type	Headphone Amplifier
Brand	AKG
Model	HPA 4000
Number of Audio Inputs	8 stereo line inputs (6.35 mm jack)
Number of Outputs	1 stereo headphone output (6.35 mm jack)
Power Supply	12 V DC, 500 mA via included power adapter
Power Consumption	Approximately 6 W
Indicators	8 blue LEDs for source and volume
Controls	On/off switch, rotary push button for source selection and volume adjustment
Main Functions	Selection of one of 8 sources, volume adjustment, headphone output standby
Housing Material	Metal (steel) for rack mounting
Dimensions (approx)	483 x 44 x 150 mm (standard 19\" rack, 1U)
Weight (approx)	1.2 kg
Included Accessories	8 audio jack cables 6.35 mm, rack mounting kit, power adapter
Optional Accessories	AKG headphones K141, K171, K240, K271, K141 Studio
Maintenance and Cleaning	Unplug the adapter, clean with a slightly damp cloth (no solvents)
Safety	Use only the supplied adapter; do not open the housing; avoid moisture and heat sources
Repairability	Contains no user-serviceable parts; contact AKG customer service
Warranty	In accordance with applicable legislation

Frequently Asked Questions - HPA 4000 AKG

How to select a source on the HPA 4000?

Briefly press the rotary button on the front panel. Each quick press activates the next channel (SOURCE 1 to 8). The LED indicator of the selected channel remains lit continuously.

How to adjust the headphone volume?

Turn the rotary button clockwise to increase volume, counterclockwise to decrease. The SOURCE LEDs indicate the level. If you hold the button pressed after the stop, the volume changes continuously.

How to put the headphone output into standby?

Hold the rotary button pressed until the SOURCE LEDs flash. To reactivate, press again until an LED stays on (volume retained) or turn the button (minimum volume).

What to do if I hear no sound?

Check that the power adapter is plugged into the amplifier and the mains, that the amplifier and receivers are powered on, and that the audio cables are correctly connected between the receivers and the SR 1-8 inputs.

Why does the amplifier load factory settings instead of my saved settings?

This can happen if the headphone output is short-circuited (check the headphones) or if the EPROM is defective. In the latter case, contact AKG customer service.

Which headphones can I use with the HPA 4000?

The HPA 4000 is compatible with any stereo headphone equipped with a 6.35 mm jack plug. AKG particularly recommends the K141, K171, K240, K271, and K141 Studio models for optimal quality.

How to clean the amplifier?

Unplug the power adapter before cleaning. Use a slightly damp cloth (not wet). Never use abrasive products, alcohol, or solvents that could damage the paint or plastics.

Can the HPA 4000 be rack-mounted?

Yes, the device is designed for installation in a 19-inch rack. A mounting kit is provided to fix it in a standard rack.

Which power supply to use?

Use exclusively the power adapter supplied with the device (12 V DC, 500 mA). Any other adapter could damage the device.

What to do if an LED does not light up?

Check that the device is powered on and that the power cable is properly connected. If the problem persists, contact AKG customer service.

USER MANUAL HPA 4000 AKG

wireless microphone system

HPA

headphone amplifier

4000

User Instructions. p. 5

Please read the manual before using the equipment!

Mode d'emploi. p. 8

K 240 DF Studio Monitor

K 240 Studio

2.4 Bedienelemente 2.4.1 Frontplatte
Fig. 1: Frontplatte des HPA 4000

1. Do not spill any liquids on the equipment and do not drop any objects through the ventilation slots in the equipment.
2. The equipment may be used in dry rooms only.
3. The equipment may be opened, serviced, and repaired by authorized personnel only. the equipment contains no user-serviceable parts.
4. Before connecting the equipment to power, check that the AC mains voltage stated on the supplied power supply is identical to the AC mains voltage available where you will use the equipment.
5. Operate the equipment with the supplied power supply with an output voltage of 12 VDC. Using adapters with an AC output and/or a different output voltage may cause serious damage to the unit.
6. If any solid object or liquid penetrates into the equipment, shut down the sound system immediately. Disconnect the power supply from the power outlet immediately and have the equipment checked by AKG service personnel.
7. If you will not use the equipment for a long period of time, disconnect the power supply from the power outlet. Please note that the equipment will not be fully isolated from power when you set the power switch to OFF.
8. Do not place the equipment near heat sources such as radiators, heating ducts, or amplifiers, etc. and do not expose it to direct sunlight, excessive dust, moisture, rain, mechanical vibrations, or shock.
9. 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.
10. Clean the equipment with a moistened (not wet) cloth only. Be sure to disconnect the power supply from the power outlet before cleaning the equipment! Never use caustic or scouring cleaners or cleaning agents containing alcohol or solvents since these may damage the enamel and plastic parts.
    11.Use the equipment for the applications described in this manual only. AKG cannot accept any liability for damages resulting from improper handling or misuse.

1.1 Safety

1. The power supply will draw a small amount of current even when the equipment is switched off. To save energy, disconnect the power supply from the power outlet if you will leave the equipment unused for a long period of time.
2. When scrapping the equipment, separate the case, circuit boards, and cables, and dispose of all components in accordance with local waste disposal rules.
3. The packaging of the equipment is recyclable. To dispose of the packaging, make sure to use a collection/recycling system provided for that purpose and observe local legislation relating to waste disposal and recycling.

1.2 Environment

2 Description

Thank you for purchasing an AKG product. This Manual contains important instructions for setting up and operating your equipment. Please take a few minutes to read the instructions below carefully before operating the equipment. Please keep the Manual for future reference. Have fun and impress your audience!

The HPA 4000 is a headphone amplifier with eight stereo line inputs and one stereo output. It allows you to monitor the output signal of any one of eight SR 4000 receivers on headphones. AKG offers suitable headphones for every application.

You can use the HPA 4000 as a standalone unit or install it in a 19" rack using the supplied Rack Mounting Kit.

2.1 Introduction

Refer to figs. 3 and 4. See SR 4000 manual for details.

2.2 Unpacking

1 HPA 4000 headphone amplifier
1 in-line power supply (if checked on the packaging)

8 audio cables with 1/4" TRS jack plugs

1 Rack Mount Kit

Check that the packaging contains all of the components listed above. Should anything be missing, please contact your AKG dealer.

K 141 Monitor

K 240 DF Studio Monitor

K 171 Studio

K 240 Studio

K 240 Monitor

K 271 Studio

2.3 Optional Accessories

2.4 Controls 2.4.1 Front Panel

Fig. 1: HPA 4000 front panel.

ON/OFF: Switches the unit on and off.

HP-OUT: 1/4^n TRS output jack for headphones.

SOURCE 1-8: These blue LEDs indicate either the selected input channel of the current volume level.

<<·s>> Setup control: This combined pushbutton/rotary control provides three functions:

Short push: Selects the input channel. The SOURCE LED for the selected channel will be lit constantly. Each short push selects the next higher input channel number. Channel 8 is followed by channel 1.

Long push: Mutes the headphone output. The appropriate number of SOURCE LEDs will flash to indicate the current volume.

Turn all the way CW or CCW and release to increase or decrease the volume by one increment. The SOURCE LEDs will indicate the change in volume level. After three seconds, only the SOURCE LED for the selected channel will remain lit.

To change the volume continuously, hold the setup control at the left (down) or right (up) stop.

Note:

You can set the volume in more than 8 increments. The next (previous) LED may therefore not be lit (extinguish) before you have notched up (down) the volume by several increments.

2.4.2 Rear Panel

Fig. 2: HPA 4000 rear panel.

DC IN: Locking DC input for connecting the included 12 VDC, 500 mA power supply.

Warning!

Operate the equipment with the included power supply with an output voltage of 12 VDC only. Using adapters with an AC output and/or a different output voltage may cause serious damage to the unit.

AUDIO IN SR 1-8: 1/4^n TRS jacks for connecting up to eight SR 4000 receivers.

3 Setting Up

Important!

Prior to setting up the unit, check that the AC mains voltage stated on the included power supply is identical to the AC mains voltage available where you will use your system. Using the power supply with a different AC voltage may cause damage to the unit. Make all audio connections before connecting the unit to power.

3.1 Audio Connections

Refer to fig. 5.

1. Use the supplied audio cables to connect the desired receivers to the AUDIO IN jacks labeled SR 1 through SR 8 on the rear panel of the HPA 4000.
2. Connect your headphones to the front panel HP-OUT jack.

3.2 Connecting the Headphone

Amplifier to Power

Refer to fig. 5.

1. Check that the AC mains voltage stated on the included power supply is identical to the AC mains voltage available where you will use your system. Using the power supply with a different AC voltage may cause damage to the unit.

2. Plug the feeder cable on the included power supply into the DC IN socket 2 on the HPA 4000 rear panel and screw down the DC connector.

3. Plug the power cable on the power supply into a convenient power outlet.

4. To power up, press the front panel ON/OFF key.

All SOURCE LEDs will be lit constantly for approx. 3 seconds, then only the LED assigned to the currently selected channel will remain lit.

1. Press and hold the setup control until the SOURCE LEDs start flashing. (The number of flashing LEDs indicates the current volume setting.)
2. You can switch the headphones output back on in one of two ways:

a) Press and hold the setup control until all SOURCE LEDs will be lit constantly for a few seconds and the LED for the selected channel alone will remain lit. The volume level will revert to the previous setting.
b) Turn the setup control all the way CW or CCW and release. The volume level will automatically change to a factory preset minimum. SOURCE LEDs 1 and 2 will be lit.

To revert to the previous volume setting, turn the setup control all the way CW.

• Press the ON/OFF key.

The SOURCE LEDs will go out. The current settings will be stored in the EPROM and automatically loaded the next time you power up.

4.1 Powering Up

4.2 Muting the

Headphone Output

4.3 Powering Down

5 Cleaning

1. Switch power to the unit off and disconnect the power supply from the power outlet.
2. Use a cloth moistened (not wet!) with water to clean the surfaces of the equipment.

Never use caustic or scouring cleaners or cleaning agents containing alcohol or solvents since these may damage the enamel or plastic parts.

Important!

Important!

6 Troubleshooting

Problem	Possible Cause	Remedy
No sound.	1. Power supply is not connected to head- phone amplifier and/or power outlet. 2. Headphone amplifier and/or receiver is OFF. 3. Receiver(s) is (are) not connected to head- phone amplifier.	1. Connect power supply to headphone amplifier and/or power outlet. 2. Switch headphone amplifier and/or receiv- er ON. 3. Connect receiver output(s) to headphone amplifier input(s).
On powering up, the unit loads the default settings (channel 1, medium volume) instead of the stored user settings.	1. Headphone output is shorted. 2. EPROM defective.	1. Disconnect and check headphones. 2. contact your nearest AKG Service Center.

1.1 Sécurité

K 240 DF Studio Monitor

K 240 Studio

K 240 DF Studio Monitor

K 240 Studio

2.1 Introduzione

ON/OFF: taste on/off

K 240 DF Studio Monitor

K 240 Studio

2.4 Controles
2.4.1 Panel frontal
Fig. 1: Panel frontal del HPA 4000

ON/OFF: control con/des

K 240 DF Studio Monitor

K 240 Studio

2.4 Elementos de controle 2.4.1 Paine frontal

Fig. 1: Paine frontal do HPA 4000

ON/OFF: tecla liga/desliga.

6 Resolver problemas

H A Harman International Company

AKG Acoustics GmbH

BodenseestraBe 228, D-81243 Munchen/GERMANY, Tel: [phone], Fax: [phone], www.akg.com/de, e-mail: [e-mail] Hotline: [phone], [e-mail]

AKG ACOUSTICS, U.S.

914 Airpark Center Drive, Nashville, TN 37217, U.S.A., Tel: [phone], Fax: [phone], www.akgusa.com, e-mail: [e-mail]

For other products and distributors worldwide see our website: www.akq.com