AKG Acoustics HEARO 777 QUADRA DELUXE Headphones Instructions

AKG Acoustics HEARO 777 QUADRA DELUXE Headphones

Product Information

• Product Name : HEARO 777 Quadra Deluxe
• Manufacturer : AKG
• Acoustics Address : 914 Airpark Center Drive, Nashville, TN 37217, U.S.A.
• Website : http://www.akgusa.com
• Email : akgusa@harman.com

Product Usage Instructions

1. Connect the AUDIO IN L and AUDIO IN R jacks on the transmitter to the corresponding jacks on your audio source.
2. Plug the supplied power adapter into the DC 9 V jack on the transmitter and connect it to a power outlet.
3. Ensure to read the manual before using the equipment for proper understanding and safety.

Safety and Environmental Information

• Safety : The manual provides important safety instructions that must be followed while using the product.
• Environment : The manual provides information on how to dispose of the product in an environmentally friendly manner.
• Cleaning : To clean the product, refer to the cleaning instructions provided in the manual.
• Troubleshooting : For troubleshooting assistance, refer to the troubleshooting section in the manual.
• Warranty : The manual contains warranty terms and conditions for the product.
• Compliance : The HEARO 777 (Receiver + Transmitter) complies with the essential requirements and relevant provisions of Directive 1999/5/EC. For more detailed instructions and diagrams, please refer to the complete user manual available at https://manual-hub.com/.

Safety and Environment

1. Operate the headphones with two AAA size 1.2 V rechargeable (supplied) or 1.5 V dry batteries only.
2. Never try to charge dry batteries using the transmitter’s charging feature.
3. Before charging the headphones batteries, always make sure that the batteries in the headphones are rechargeable types.
4. Dispose of spent dry or rechargeable batteries conforming to local waste disposal rules. Never throw batteries into the fire.
5. Operate the transmitter with the supplied 9 VDC, 500 mA AC adapter only. Check that the AC voltage stated on the AC adapter is the same as that available in your country. Using the transmitter with a different AC adapter voids the warranty.
6. Always switch the headphones OFF after use.
7. Never try to open the headphone or transmitter case. Refer servicing to qualified service personnel only.
8. Never place the equipment near heat sources such as radiators or electric heaters, or expose it to direct sunlight, excessive dust, humidity, rain, vibrations, or impacts.
9. Never use alcohol, petroleum-based cleaners, or paint thinners to clean the headphone or transmitter case.
10. If you do not use your transmitter for an extended period of time (e.g., when traveling), disconnect the AC adapter from the AC outlet.
11. Also refer to section 4.1 Important

Notes

1. Be sure to dispose of used batteries as required by local waste disposal rules. Never throw batteries into a fire (risk of explosion) or garbage bin.
2. When scrapping the equipment, remove the batteries, separate the case, circuit boards, and cables, and dispose of all components in accordance with local waste disposal rules.

Description

Dear Customer
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!
If you have any questions beyond the scope of this Manual, do not hesitate to visit our website at: http://www.akg.com

Your headphones system comprises the following components

HEARO 777 QUADRA
pair of headphones

1. transmitter with integrated battery charger
2. stereo connecting cables with gold plated connectors: 1 RCA
   • cable, 1 jack cable (mini jack to 2 x RCA connectors)
   • 1 mini jack to 1/4″ jack adapter
   • 1 9 VDC, 500 mA AC adapter for powering the transmitter

V AAA size NiMH rechargeable batteries for powering the

HEARO 777 QUADRA DELUXE
1 pair of headphones

1. transmitter with integrated battery charger
2. stereo connecting cables with gold plated connectors: 1 RCA
   • cable, 1 jack cable (mini jack to 2 x RCA connectors)
   • 1 mini jack to 1/4″ jack adapter
   • 1 9 VDC, 500 mA AC adapter for powering the transmitter

V AAA size NiMH rechargeable batteries for powering the headphones (inside the headphones)

velour replacement ear pads

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

Optional Accessory
General Description

External charger for headphones

This headphone system

• uses state-of-the-art UHF radio transmission technology;
• connects to any audio, video, TV set, or PC with a headphones or line output;
• provides perfect sound reproduction, full mobility, and signal transmission through walls and ceilings over a distance of up to 330 feet (100 m);
• provides three selectable carrier frequencies and an “Autotuning” function that automatically tunes the headphones to the transmitter frequency for optimum reception;
• uses proprietary IVA technology for exceptionally realistic, three-dimensional listening;
• features an integrated Dolby Surround Pro Logic decoder for perfect reproduction of hi-fi, TV, PC, or video sound in Dolby surround format;
• provides a LOGIC7 decoder for adaptive simulation of up to eight loudspeakers with automatic adjust-ment to the input signal format and full compatibility to Dolby Surround.

The HEARO 777 QUADRA systems let you share your listening enjoyment with other persons. You can operate your transmitter with several headphones simultaneously. HEARO 777 headphones are also avai-lable separately.

IVA – Individual Virtual Acoustics
One drawback of headphone listening is the psychoacoustic phenomenon of “inside localization”: the orchestra seems to play inside your head rather than in the room. AKG developed a binaural audio processing technique called IVA (Individual Virtual Acoustics) that models the way the head and pinnae change the arriving sound waves (ear matching function). Thus, the various sound sources will seem to be located outside your head even when you are using headphones.

Description

Natural hearing : Due to the effect of the head and pinnae, sound waves arriving at one ear differ from those arriving at the other. Amplitude and phase differences create a sense of spatial hearing.
Listening through headphones : Amplitude and phase differences are eliminated. Sound sources are localized inside the head rather than in the room.
Listening through headphones with IVA processing : The ear matching function modifies the audio signals at the ears to resemble diagram A. This restores natural, spatial hearing.

Dolby Surround Pro Logic Decoderv
The Dolby Surround Pro Logic decoder integrated in the transmitter uses the stereo input signal to derive two additional signals, a center and a surround channel. The IVA circuitry generates from these signals a binaural signal equivalent to reproduction through five high quality loudspeakers (three front, two rear speakers). This allows you to enjoy all the benefits of Dolby surround sound even through headphones.

LOGIC7 Decoder
The integrated LOGIC7 decoder allows recordings in all audio formats (mono, stereo, Dolby Surround, and LOGIC7) to be accurately reproduced through headphones. Depending on the momentary signal configuration, two to eight loudspeakers are simulated at any time. Accordingly, the number of simulated speakers may even change automatically during the same piece.
Also, the LOGIC7 decoder will derive a surround signal from a stereo input signal and is fully compatible to Dolby Surround.

Controls
Headphones Refer to figs. 1 and 12.

1. POWER: On/off button surrounded by an annular bicolor status LED (1a).

   • The status LED will light green to indicate the headphones are ON.
   • The status LED will light red while the batteries inside the headphones are being charged.

2. Charging contacts for charging the batteries on the transmitter.

   • 2a Charging jack for the optional external charger.

3. Battery compartments (beneath the detachable left-hand ear pad): The battery compartments hold two NiMH rechargeable batteries electrically isolated from the receiver circuitry by a protective foil. You cannot charge the batteries before removing the protective foil.

4. AUTOTUNING switch: activates the automatic tuning function

5. VOLUME control
   Transmitter Front Panel Refer to fig. 2.

6. ON : Switches the transmitter on (switch illuminates green) and off (switch extinguishes).

7. DISPLAY : Switches the backlighting for all labels except the ON switch and the CHARGE label on and off.

   • If you switch the backlighting off, it will come back on automatically as soon as you push any front panel switch.
   • If you switch the transmitter off and back on later, the backlighting will come on again, even if you switched the backlighting off.

8. FREQ: Steps through three fixed carrier frequencies within the frequency band of your headphones system.

   • The labels FREQ 1, FREQ 2, or FREQ 3 will illuminate to indicate the selected frequency.

9. MODE: Steps through normal stereo, IVA stereo, IVA plus Dolby Surround Pro Logic, and IVA plus LOGIC7 modes.
   The STEREO, IVA, PRO LOGIC, and LOGIC7 labels will illuminate to indicate the selected mode

• LEVEL: As long as audio signal is present at the transmitter input, the green LEVEL label will flicker in step with the signal level.
• Since signal levels are controlled automatically, the transmitter has no input gain knob.
• Charging contacts: The transmitter provides charging contacts in the left-hand earphone receptacle.
• When you place the headphones in the receptacles, the batteries inside the headphones will be charged automatically.
• CHARGE: This label indicates the charging function status
• The CHARGE label illuminates to indicate the batteries inside the headphones are being charged. Since the charging circuitry operates independently from the rest of the transmitter circuitry, the CHARGE label will light even if the transmitter is OFF.
• The CHARGE label will remain dark when no current flows from the transmitter through the charging contacts to the batteries inside the headphones (transmitter is not connected to power, no head-phones resting on the transmitter, no batteries inside the headphones, batteries inserted incorrectly, contaminated charging contacts).
• Rear Panel Refer to fig. 3.
• AUDIO IN L/R : Left and right RCA audio input jacks.
• DC 9 V : Input jack for the AC adapter.
• OO: TRS mini jack input for audio sources.

Audio and Power Connections

Connecting to a Headphone Output Refer to fig. 4.

1. Before connecting the transmitter to your audio source, switch the audio source OFF.
2. Plug the red RCA connector (right channel) on the supplied jack cable into the red AUDIO IN R socket (13) and the white RCA connector (left channel) into the white AUDIO IN L socket (13) on the transmitter rear panel.
3. Connect the stereo mini jack plug of the jack cable to the headphones output of your audio source.
4. If the headphones output on your equipment is a 1/4″ jack, plug the supplied mini jack to 1/4″ adapter jack onto the jack cable. Connect the adapter jack to the headphone output.

Connecting to a LINE or REC Output

Refer to fig. 5.

1. Before connecting the transmitter to your audio source, switch the audio source OFF.
2. Use the supplied RCA cable to connect the white LINE OUT L or REC OUT L jack on your audio source to the white AUDIO IN L jack (13) on the transmitter rear panel and the red LINE OUT R or REC OUT R jack to the red AUDIO IN R jack (13).

Alternatively, you can use the supplied jack cable

1. Plug the white RCA connector (left channel) on the jack cable into the white LINE OUT L or REC OUT L socket on your audio source and the red RCA connector (right channel) into the red LINE OUT R or REC OUT R socket.
2. Plug the mini jack plug on the jack cable into the OO jack (15) on the transmitter rear panel.
   Refer to fig. 6.

Important!
Never connect two audio sources simultaneously to the transmitter inputs. Playing back two audio signals at the same time may cause severe distortion.

Connecting the Transmitter to AC Power Important!
Check that the AC voltage stated on the supplied AC adapter is identical to the AC voltage available where you will use your system. Using the AC adapter with a different AC voltage may cause damage to the unit.

Refer to fig. 7.

1. Connect the cable on the supplied AC adapter to the DC 9 V jack (14) on the transmitter rear panel.
2. Connect the AC adapter to a convenient AC outlet.

Operating Notes

• Your HEARO 777 is a radio frequency device that conforms to the strict European and FCC standards. For physical reasons that are not related to the quality of the product, extremely strong interference sour-ces may affect reception. In order to maintain interference-free listening pleasure, do not operate your HEARO 777 in the close vicinity of radio equipment, cellular telephones, or directly above TV or computer monitor picture tubes. The supplied connecting cables are long enough to allow the transmitter to be placed at a safe distance from interference sources.
• Reflections off metal surfaces may reduce the range of your transmitter. Therefore, be sure to place the transmitter at least 8 inches (20 cm) away from any kind of metal surface.
• Operating switches on or connecting the transmitter to your audio source may cause clicks which at high volume settings may affect your hearing. Therefore, be sure to set the VOLUME control on the head-phones to minimum before switching between different sources (tuner, turntable, CD player, etc.) or connecting the transmitter.
• Listening over headphones at high volume levels, particularly over extended periods of time, may damage your hearing.
• Interference caused by other users of the same LPD band are beyond AKG’s control.

If you operate the headphones on dry batteries, never try to charge the batteries using the trans-mitter’s charging feature. This would cause serious damage to your headphone system. Dispose of dead batteries conforming to local waste disposal rules.

Important Notes Placing the transmitter
Refer to fig. 8.
Refer to fig. 9.

• Switching noise
• High volume levels
• Interference

Charging the Batteries in the Headphones Warning!

Operating Notes

Important!
In order to ensure the longest possible service life for the rechargeable batteries, we deliver them uncharged. Therefore, charge the supplied batteries before first operating your headphones system.

Note

1. Before first charging the batteries inside the headphones, pull the protective foil out of the left-hand earphone following the direction of the arrow.
   The batteries will make electrical contact with the electronic circuitry of the headphones.

2. Check that the headphones are OFF. If the status LED (1a) is shining green, push the POWER button (1) to switch power to the headphones off. The status LED (1a) will extinguish.
   As long as the headphones are ON, the batteries will not be charged.

Charging on the transmitter
Charging on the transmitter: power outlet.
Since the charging function operates independently of the rest of the transmitter circuitry, you do not need to press the ON key (6) to charge the batteries.

Refer to figs. 10, 1, and 2
Place the headphones on the transmitter

• The charging contacts on the transmitter and those on the headphones will automatically close the charging circuit and charging will start.
• The CHARGE label (12) on the transmitter and the status LED (1a) on the headphones will illuminate red to indicate the batteries are being charged.
• The batteries will be fully charged after approximately 14 hours. (The CHARGE label (12) on the transmitter and the status LED (1a) on the headphones will continue shining red.)
• Remove the headphones from the transmitter to stop the charging. (The charging contacts will open and the CHARGE label (12) on the transmitter and the status LED (1a) on the headphones extinguish.)
• If you forget to remove the headphones, do not panic. You can leave the headphones on the transmitter for as long as you like without risking to overcharge the batteries.

Using the optional external charger

Important: Check that the AC voltage stated on the optional charger is identical to the AC voltage available where you will use your system. Using the charger with a different AC voltage may cause damage to the unit.

Refer to figs. 11, 1, and 2

1. Plug the charging cable on the charger into the charging jack (2a) on the headphones.
2. Plug the charger into a convenient power outlet.
3. The status LED (1a) on the headphones will illu-minate red.
4. The batteries will be fully charged after approxi-mately 14 hours. (The status LED (1a) on the headphones will continue shining red.)
5. Disconnect the charging cable from the charging jack (2a) on the headphones to stop the charging.
6. The status LED (1a) on the headphones will extinguish.
   If you forget to disconnect the charging cable, do not panic. You can leave the headphones connected to the charger for as long as you like without risking to overcharge the batteries.

Replacing Batteries
The capacity of any rechargeable battery will decrease over time. If you feel that you need to recharge the supplied batteries more often than would be convenient, you may consider replacing the batteries with new AAA size 1.2 V rechargeable or 1.5 V alkaline dry batteries.

Refer to fig. 12.

1. Rotate the ear pad on the left-hand earphone approximately 10° CCW to unlock the bayonet mount and remove the ear pad.
2. Remove the dead rechargeable or dry batteries.
3. Insert the new batteries aligning them with the polarity symbols inside the battery compartments (3) in the earphone.
4. Replace the ear pad on the earphone and rotate the ear pad approximately 10° CW to the point that you can feel it has locked.

Setting Up the System

1. Remove the headphones from the transmitter.
2. Switch ON the audio source to which your transmitter is connected.
   • Press the ON switch (6) to switch the transmitter on.
   • The ON switch (5) will illuminate green.
   • The MODE and FREQ settings will be the same as those you have selected before switching the trans-mitter off. (As delivered, the transmitter is set to STEREO mode and FREQ 1.)
   • The label backlighting will come on every time you switch the transmitter on even if you switched the backlighting off before.
   • If there is audio signal present at the transmitter input, the LEVEL label (10) will flicker in step with the signal.
3. Switch the headphones on by pushing the POWER button (1).
   • The status LED (1a) will illuminate green.
4. Press the AUTOTUNING switch (4) on the headphones.
   • The Autotuning function will automatically tune the receiver to the carrier frequency set on the trans-mitter. After a few seconds, you should hear the signal in the headphones clearly and free of inter-ference.
   • If your first try fails, press the FREQ key (8) on the transmitter front panel to select a different carrier frequency and press AUTOTUNING (4) again. Be sure to stay near the transmitter during this operation.
5. Set the VOLUME control (5) on the headphones to the desired volume level.
   If the transmitter signal is disturbed, e.g., by reflections (multipath reception) or shadow effects, the headphones will automatically mute. This function eliminates interference-related noise.

As delivered, the transmitter is set to STEREO mode.
Press the MODE key (9) to step though the playback modes of your headphones system

IVA LOGIC7: The LOGIC7 decoder is on and con- stantly monitors the input signal. Depending on the input signal format, the decoder will generate the required number of audio signals. The IVA processor will simulate the corresponding number of loudspeakers (up to eight for LOGIC7 input signals).

We recommend this mode for all types of audio signals (music, movies, games).

| Labels LOGIC7 and IVA are illuminated.
---|---
IVA PRO LOGIC: The Dolby Surround Pro Logic decoder, in conjunction with the IVA processor, simulates five loudspeaker channels (front left, center, right and rear left and right) for surround sound in the headphones. This channel configura- tion will not change.

We recommend this mode for movies and Dolby Surround recordings.

| Labels PRO LOGIC and IVA are illuminated.
IVA STEREO: The IVA processor converts the stereo input signal to a binaural signal. The ear matching function provides a natural sonic per- spective with no inside localization.

We recommend this mode for natural reproduction of stereo music and speech signals.

| Labels IVA and STEREO are illuminated.
STEREO: The Pro Logic decoder, the LOGIC7 decoder, and the IVA processor are deactivated and you will hear the unchanged stereo input sig- nal in the headphones.| The STEREO label is illuminated.

Replacing Ear Pads
(HEARO 777 QUADRA DELUXE)

1. Rotate the ear pad on each earphone approximately 10° CCW to unlock the bayonet mount and remove the ear pad.
2. Place one velour ear pad on each earphone and rotate the ear pad approximately 10° CW to the point that you can feel it has locked.

Cleaning

1. Disconnect the AC adapter from the power outlet.
2. Use a cloth moistened (not wet!) with water to clean the surfaces of the mixer.

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

Troubleshooting

1. AC adapter is not connected to transmitter and/or AC outlet.

2. Transmitter is OFF or not connected to audio source.

3. Connected audio source is switched off.
   Volume control on audio source is set too low.

4. Batteries are low.

5. Headphones are OFF.

6. Volume control on headphones is at zero.

|

1. Connect AC adapter to transmitter and/or AC outlet.
2. Switch transmitter on or connect to audio source.
3. Switch audio source on to feed signal to transmitter input.
4. Increase volume to the point that LEVEL illuminates.
5. Charge batteries.
6. Switch headphones on.
7. Set volume control to desired level.

CHARGE label does not light.|

1. Transmitter is not connected to AC power.
2. No batteries inside the headphones.
3. Batteries are not correctly aligned with polarity marks.
4. Headphones are incorrectly positioned on transmitter.
5. Headphones are ON.

|

1. Connect transmitter to AC power.
2. Insert batteries.
3. Check orientation of batteries in battery compartment.
4. Place headphones on transmitter correctly.
5. Switch headphones OFF.

Mono sound.|

1. Connected audio source operates in mono mode.
2. Transmitter is not correctly connected to audio source.

|

1. Switch audio source to stereo mode.
2. Check cable connection between transmitter and audio source.

Noise.|

1. Transmitter and receiving frequencies are not identical.
2. Audio level at transmitter input is too low.
3. Input signal is noisy.
4. Batteries are low.

|

1. Near the transmitter, press AUTOTUNING switch on headphones or use FREQ key on transmitter to select different carrier frequency and press AUTOTUNING on headphones.
2. Turn up audio source volume control and/or INPUT LEVEL control on transmitter.
3. Check audio source.
4. Charge batteries.

Distorted sound.| Batteries are low.| Charge batteries.
Intermodulation noise.|

1. Electrical appliances with poor interference protection.
2. Audio source or sound carrier defective.

|

1. Switch off any “suspicious” appliances (if possible).
2. Check audio source or sound carrier.

Headphones receive unwanted

1. transmitters.

|

1. A neighbor uses similar UHF headphones.

|

1. Use FREQ key on transmitter to select dif- ferent carrier frequency and, staying close to transmitter, press AUTOTUNING switch on headphones.

Overemphasized bass or treble range.|  Bass or treble control settings on audio source.| Readjust bass or treble controls.

Specifications

• System Performance
• Transmitter
• Headphones

Standards
This equipment conforms to standards EN301357-2 (7-2000), EN301487-09 (9-2000), EN 60950:1992 + A1:1993 + A3:1995 + A4:1997 + A11:1997.

Dolby, Lexicon
Manufactured under license from Dolby Laboratories. “Dolby”, “Pro Logic”, and the double-D symbol are trademarks of Dolby Laboratories.
LOGIC7 and the LOGIC7 logo are registered trademarks of Lexicon, Inc., A Harman International Company.

Warranty Conditions

• AKG warrants AKG products against evident defects in material and workmanship for a period of two years from the date of original purchase for use. This Warranty does not cover damage resulting from misuse or abuse, or lack of reasonable care, or inadequate repairs performed by unauthorized service centers. Performance of repairs or replacements under this Warranty is subject to submission of the sales slip. Shipment of defective items for repair under this Warranty will be at the customer’s own risk. This Warranty is valid for the original purchaser only.
• Limited Warranty (valid in the United States only)
• AKG warrants AKG products against evident defects in material and workmanship for a period of one year and agrees to repair or, at our option, replace any defective unit without charge for either parts or labor.
• This Warranty does not cover dry or rechargeable batteries.
• Important: This Warranty does not cover damage resulting from accident, misuse or abuse, lack of rea-sonable care, the affixing of any attachment not provided with the product, loss of parts, or connecting the product to any but the specified receptacles. This Warranty is void unless service or repairs are per-formed by an authorized service center. No responsibility is assumed for any special, incidental, or con-sequential damage. However, the limitation of any right or remedy shall not be effective where such is prohibited or restricted by law. Simply take or ship your AKG products prepaid to our service department. Be sure to include your sales slip as proof of purchase date. (We will not repair transit damage under the no-charge terms of this Warranty.)

Note: No other warranty, written or oral, is authorized by AKG Acoustics.
This Warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Some states do not allow the exclusion or limitation of incidental or consequential damage or limitations on how long an implied warranty lasts, so the above exclusion and limitations may not apply to you.

DECLARATION OF CONFORMITY
Document No.272 / 10 – 2001 replaces No. /

Type of Product: Wireless Dolby Stereo Surround Headphone Set

Brand, Model No.

• Hearo 777 Quadra (Receiver and Transmitter) and
• Hearo 777 Quadra Deluxe (Receiver and Transmitter) (Including Power Supply)

Drawing No.: 6000

• H Manufacturer: AKG Acoustics GmbH
• A-1230 Wien, Lemböckgasse 21 – 25
• AUSTRIA

We declare that the above mentioned product is in conformity with the following European Directive

• No. 99/5 EC;
• Radio Equipment and
• Telecommunications Terminal Equipment

The conformity is achieved by fuifilling the following European Standard(s)

EN 301489-9, EN 61000-3-2 + A1 + A2 + A14, EN 61000-3-3, EN 301357-2, EN 60950

• A1 + A2 + A3 + A4 + A11

Product examination was carried out by

• TÜV-Osterreich, Notified Body 0408
• Deutschstraße 10
• A-1230 Wien
• City, Date: Wien, 15.10.2001
  Manufacturer’s Signature

Managing Director
Dr. Hugo Lenhard-Backhaus

This declaration certifies the accordance with the above mentioned EC- Directive but does not assure certain attributes of the product.

AKG Acoustics GmbH hereby declares that the product HEARO 777 (Receiver + Transmitter) complies with the essential requirements and other relevant provisions of Directive 1999/5/EC.

References

• AKG
• Akgusa.com is for sale | HugeDomains
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