Acoustic Research Headphones AW791 User Manual

15791-0-2  
AD 34972  
10/01  
W ir e le s s S u r r o u n d S o u n d H e a d p h o n e s  
with Dolby® Digital technology  
Model AW791  
In s t a lla t io n a n d O p e r a t io n M a n u a l  
Covered by one or more of the following US patents and Patents  
Pending: 5,272,525; 5,410,735; 5,666,658; and 6,215,981.  
U.S. Patent Nos.5,371,799; 5,436,975; 5,809,149 and various  
foreign counterparts. Copyright QSound Labs, Inc. 1996-2001.  
®
Recoton Accessories, Inc.  
Manufactured under license from Dolby Laboratories. "Dolby",  
"Pro Logic", and the double-D symbol are trademarks of Dolby  
Laboratories. Confidential unpublished works.  
2950 Lake Emma Road  
Lake Mary, FL 32746  
© 2001 Recoton  
Copyright 1992-1997 Dolby Laboratories. All rights reserved.  
All trademarks are the property of their respective owners.  
MADE IN CHINA  
 
C o n n e c t in g  
L o c a t io n  
H e a d p h o tnh ee S y s t e m  
F u n co tf io n s  
I
II  
i. S e t u p :  
Tr a n s m it t e r F r o n t V ie w :  
A. Surround Sound ON/OFF Switch  
B. Surround Sound ON/OFF Light  
C. Input Indicator Lights  
1. Digital Coaxial  
Place the Transmitter in a location with enough clearance so that you can  
store the Headphones on the Transmitter. This is important, because the  
Transmitter charges the Rechargeable Batteries (P) inside the headphones so  
they are always ready for use. See Charging the Batteries on page 5.  
2. Digital Optical  
3. Analog  
D. Input Select Switch  
You can use the Surround Sound Headphones with up to three different  
audio/video components. The three inputs on the transmitter two digital  
and one analog allow quick and easy connections for maximum versatility.  
S
S
1
2
3
A
B
C1 C2 C3  
D
Tr a n s m it t e r B a c k V ie w :  
E. AC Input Jack  
ii. C o n n e c t in g t o D ig it a l C o m p o n e n t s :  
a. Connecting Using the Supplied Toslink® Digital Optical Cable:  
F. Input Connectors  
C
H
A
N
N
E
L
G
1. RCA-type Digital Coaxial Connector  
2. Toslink® Digital Optical Connector  
3. RCA-type Analog Left/Right Connectors  
G. Channel Select Switch  
A
B
C
1. Connect one end of the  
Toslink® Digital Optical  
TRANSMITTER  
A
C
7
V
C
H
A
N
N
E
L
D
IG IT A L 1  
D
IG IT A L 2  
A
N A L O G 3  
Cable (Q) to the  
DIGITAL OPTICAL  
A
B
C
E
F1 F2 F3  
A
C
7
V
OUTPUT of your  
D
IG IT A L 1  
D
IG IT A L 2  
A
N
A L O G 3  
audio/video equipment.  
2. Connect the other end  
of the Toslink® Digital  
Optical Cable (Q) to the  
Toslink® Digital Optical  
Connector (F2) on the  
transmitter marked  
Digital 2.  
H e a d p h o n e s :  
DVD PLAYER  
H. Battery Compartment  
OUTPUT  
COMPONENT VIDEO  
J
I.  
J.  
Battery Compartment Cover  
Self-adjusting Headband  
RED  
GREEN  
BLUE  
RIGHT  
LEFT  
VIDEO OPTICAL D-COAX  
K. Power Indicator Light  
L. Volume Control  
M. ON/OFF/Tuning Control  
N. Stereo Tuning Indicator Light  
H
I
b. Connecting Using a Digital Coaxial Cable:  
M
1. Connect one end of the  
Digital Coaxial Cable  
(not included) to the  
DIGITAL COAXIAL  
L
TRANSMITTER  
K
N
C
H
A
N
N
E
L
A
B
C
A c c e s s o r ie s :  
A
C
7
V
D
IG IT A L 1  
D
IG IT A L 2  
A
N
A
L
O
G
3
OUTPUT of your  
O. Transmitter AC Power  
Supply - 7V AC 1.4A  
P. Rechargeable Batteries  
3 AAA Ni-MH  
Q. 3 ft. Toslink® Digital  
Optical Cable  
audio/video equipment.  
2. Connect the other end of  
the Digital Coaxial Cable  
to the RCA-type Digital  
Coaxial Connector (F1)  
on the transmitter  
P
O
DVD PLAYER  
OUTPUT  
COMPONENT VIDEO  
RED  
GREEN  
BLUE  
RIGHT  
LEFT  
VIDEO OPTICAL D-COAX  
marked Digital 1.  
Q
 
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iii. C o n n e c t in g t o A n a lo g C o m p o n e n t s :  
C h a r g in g  
t h e  
B a t t e r ie s  
III  
You can connect the headphones to an analog device and listen to Dolby  
Pro Logic recordings and compact discs.  
Note: The rechargeable batteries included with this product must be  
1. Connect one end of the  
TRANSMITTER  
charged for 10 hours before use.  
Analog Audio Cable (not  
C
H
A
N
N
E
L
A
B
C
included) to the RCA-TYPE  
ANALOG AUDIO OUTPUT of  
your audio/video equipment.  
2. Connect the other end of  
the Analog Audio Cable to  
the RCA-type Analog  
i. In s e r t in g t h e B a t t e r ie s in t o t h e H e a d p h o n e s :  
A
C
7
V
D
IG IT A L 1  
D
IG IT A L 2  
A
N A L O G 3  
1. Remove the Battery Compartment  
Cover (I) by simultaneously  
depressing the tab and pulling up on  
the cover.  
2. Pull the cloth strip across the Battery  
Compartment (H) so the  
VCR  
OUTPUT  
INPUT  
LEF I EO  
RIGHT  
LEF  
T
V
ID  
EO  
RIGHT  
T
V
D
TV  
OUT  
ANTENNA  
IN  
Left/Right Connectors (F3)  
on the transmitter marked  
Analog 3.  
Rechargeable Batteries (P) can be  
inserted over the strip.  
3. Insert the Rechargeable Batteries (P)  
+
+
observing the polarity ("+" and "-") as  
diagrammed inside the Battery  
Compartment (H).  
Note: When using a device with a variable analog output, make sure the  
volume level is set to 1/2 to 2/3 volume. When using a variable level  
output, noise may occur if the signal level is too weak or too strong. Adjust  
the volume to eliminate the noise.  
+
4. Replace the Battery Compartment  
Cover (I).  
ii. C h a r g in g t h e B a t t e r ie s w it h in t h e H e a d p h o n e s :  
iv. C o n n e c t in g t h e P o w e r S u p p ly :  
1. Place the headphones onto the  
Transmitter, making sure the  
1. Insert the 2.5mm barrel  
TRANSMITTER  
connector from the AC Power  
Supply (O) into the AC Input  
Jack (E).  
C
H
A
N
N
E
L
charging contact on the left earcup is  
sitting properly on the charging post  
of the transmitter.  
A
B
C
A
C
7
V
D
IG IT A L 1  
D
IG IT A L 2  
A
N
A
L
O
G
3
2. Plug the AC Power Supply  
(O) into a standard electrical  
wall outlet.  
2. Allow the Rechargeable Batteries (P)  
to fully charge for 10 hours before  
using for the first time.  
3. Place the headphones on the  
transmitter when not in use. This will  
ensure the batteries are always fully  
charged for hours of entertainment.  
The Rechargeable Batteries (P) use  
S
S
1
2
3
high-capacity Ni-MH cells that allow  
recharging without the memory  
effect of Ni-CD cells.  
Note: Make sure the electrical outlet is not a switched outlet - usually  
designed to control a lamp - and remains ON at all times. This is important,  
as the transmitter base charges the headphones when not in use.  
F o r c u s t o m e r s in t h e U S A a n d C A N A D A  
RECYCLING NICKEL METAL-HYDRIDE BATTERIES  
Nickel Metal-Hydride (Ni-MH) batteries are recyclable. Acoustic Research asks you to help  
preserve our environment and recycle any unwanted Ni-MH batteries at your nearest  
recycling facility for proper disposal.  
Acoustic Research participates in the Rechargeable Battery Recycling Corporation (RBRC)  
program. If you need advise on proper disposal of the included Ni-MH batteries, please call  
1-800-822-8837 (US and CANADA ONLY).  
Caution: Do not handle damaged or leaking batteries.  
 
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L is t e n in g  
t o t h e  
T r o u b le s h o o t in g  
IV  
VI  
H e a d p h o n e s  
1. Turn on the component you wish to listen to (DVD player, VCR, TV, or  
another audio/video product).  
2. Press the Input Select Switch (D) to choose the device you wish to listen to,  
i.e., Digital 1, Digital 2, or Analog 3.  
The following troubleshooting guide takes you through some of the most common issues  
and solutions associated with the installation and/or operation of the Wireless Surround  
Sound headphones.  
Is s u e  
C a u s e a n d S o lu t io n  
3. Press the Surround Sound ON/OFF Switch (A) to turn the effect ON or  
OFF depending on the source material you wish to listen to. The virtual  
Surround Sound should be on for all Dolby Digital or Dolby Pro Logic  
encoded source material. All stereo music CDs, cassette tapes, or AM/FM  
radio should be experienced with the virtual Surround Sound OFF.  
See Processing Modes below.  
4. Turn the headphones ON by pressing the ON/OFF/Tuning Control (M).  
The headphones may take a few seconds to tune.  
5. Put the headphones on your head.  
No Sound  
Check that the AC Power Supply (O) is fully inserted into the wall outlet  
and the barrel connector from the AC Power Supply (O) is firmly  
connected to AC Input Jack (E). When the AC Power Supply (O) is  
properly connected and providing power, the Surround Sound ON/OFF  
Light (B) and Analog Input Indicator Light (C3) should be ON prior to  
making any selections.  
Check that the headphones are turned "ON" and the red Power Indicator  
Light (K) is brightly lit.  
Check that the Rechargeable Batteries (P) are firmly seated in the Battery  
Compartment (H) following the polarity markings in the Battery  
Compartment (H).  
6. Adjust the volume (L) to a comfortable listening level.  
7. When finished, power down the headphones by depressing the  
ON/OFF/Tuning Control (M) until the Power Indicator Light (K) is OFF.  
Check that the audio source (DVD player, TV, VCR) is turned "ON" and  
providing sound as it normally should.  
Check that the headphone Volume Control (L) is turned up.  
If the Surround Sound LED (B) is blinking, this indicates that the input is  
DTS encoded. This product does not decode DTS 5.1 encoded digital  
signals. Refer to your DVD, Satellite, or other manual to change the audio  
mode from DTS output to Dolby Digital or PCM output.  
Note: Usually you can select among PCM, Dolby Digital and DTS output  
formats on DVD players and satellite receivers.  
Check that the components digital sampling rate output is 48K  
samples/second or lower. This product does not support 96K  
samples/second. Refer to the component's manual to change the audio  
sampling rate output.  
Note: The headphones must be OFF for the batteries to charge properly.  
Make sure the Power Indicator Light (K) is OFF before charging.  
P r o c e s s in g  
V
M o d e s  
1. For multi-channel inputs (Dolby Digital inputs), the "virtual mode"  
processing uses 5.1 channel Dolby Digital decoding then virtual  
processing to create a 2 channel 3-D room equivalent output.  
Distortion/Static  
Check that the headphone Tuning Indicator Light (N) is illuminated. If  
not, push the ON/OFF/Tuning Control (M) to manually search for the  
channel. If it does not lock quickly, change the Channel Select Switch (G)  
to one of the other two channels.  
2. For multi-channel inputs (Dolby Digital inputs), the "stereo mode"  
processing uses 5.1 channel Dolby Digital decoding/processing for any  
number of channels to create a 2 channel equivalent output. If the multi-  
channel input is stereo, then the 2 channel output is stereo (i.e., Dolby  
Digital Stereo).  
Check the batteries - they may be weakening.  
Confirm the batteries are "good." When batteries begin to weaken, there  
can be static breakup. If necessary, recharge the batteries.  
Change the physical location of the transmitter. Locate it as high and free  
of obstruction as possible. Avoid placing the transmitter directly on top of  
a TV.  
3. For Analog or PCM inputs, the "virtual mode" processing uses Dolby Pro  
Logic decoding then virtual processing to create a 2 channel 3-D room  
equivalent output.  
Check that the Digital Coaxial Output from the DVD, satellite, etc., is  
not connected to the Analog Audio Inputs (F3).  
4. For Analog or PCM inputs, the "stereo mode" processing uses direct  
stereo decoding to create a 2 channel stereo output.  
Sound from One Check the left/right balance control on the audio source.  
Earpiece Only  
Check that the Tuning Indicator Light (N) is illuminated.  
Check the batteries they may be weakening.  
Note: This product does not decode DTS 5.1 encoded digital signals.  
Check that both Analog Audio Input Connectors (F3) are properly  
connected, and that the audio source (VCR, TV, etc.) is equipped with  
Stereo Analog Audio Output.  
 
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W a r r a n t y  
S p e c if ic a t io n s  
VII  
VIII  
ONE YEAR WARRANTY  
H e a d p h o n e s :  
Recoton Corporation (Company) warrants to the original retail purchaser of this  
product that should the product or any part thereof be proven defective in material  
or workmanship within one year from the date of original purchase, such defects will  
be repaired or replaced, at the Companys option, without charge for parts or labor.  
Push-button tuning  
40mm titanium-impregnated elements with neodymium magnets  
Frequency response: 20Hz 20kHz  
To obtain replacement within the terms of this warranty, the product should be delivered,  
transportation prepaid, to the Dealer where purchased or to the Company, along with proof of  
date of purchase. Call 1-800-RECOTON to obtain information regarding the procedure for  
proper return of your product, if your Dealer does not honor the warranty. This warranty is  
valid in the USA and Canada only.  
Tr a n s m it t e r :  
Signal-to-Noise ratio: >70dB  
Stereo separation: >35dB  
Dolby Digital processor  
THIS WARRANTY DOES NOT APPLY TO ANY PRODUCT OR PART THEREOF W HICH  
HAS BEEN DAMAGED THROUGH ALTERATION, MISHANDLING, MISUSE, NEGLECT,  
ACCIDENT, IMPROPER INSTALLATION OR UNAUTHORIZED REPAIR.  
Virtual Surround Sound headphone technology  
Effective transmitting range: 300 feet*  
Three separate transmission channels  
20 bit ADC/DAC  
Optical input connector conforms to EIAJ standard CP-1201  
Compatible digital audio sampling rates: 32K, 44.1K, 48K samples/second  
Dolby Digital in IEC 1937 format (formerly IEC 958 Annex B) as specified in  
ATSC A/52 Annex B  
THIS WARRANTY IS EXCLUSIVE AND IN LIEU OF ANY AND ALL OTHER WARRANTIES,  
EXPRESSED OR IMPLIED, INCLUDING W ITHOUT LIMITATION THE IMPLIED  
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE  
AND ANY OBLIGATION, LIABILITY, RIGHT, CLAIM OR REMEDY IN CONTRACT OR  
TORT, W HETHER OR NOT ARISING FROM THE COMPANY’S NEGLIGENCE, ACTUAL OR  
IMPUTED. NO PERSON OR REPRESENTATIVE IS AUTHORIZED TO ASSUME FOR THE  
COMPANY ANY OTHER LIABILITY IN CONNECTION W ITH THE SALE OF THIS  
PRODUCT. IN NO EVENT SHALL COMPANY BE LIABLE FOR INCIDENTAL OR  
CONSEQUENTIAL DAMAGES.  
Th is w arran t y g ives you sp ecific leg al rig h t s an d you m ay also h ave ot h er rig h t s  
w h ich vary from st at e t o st at e/ p rovin ce t o p rovin ce, so som e of t h e ab ove  
lim it at ion s or  
PCM in AES/EBU format  
exclusion s m ay n ot ap p ly t o you.  
In c lu d e d In s id e :  
NON-WARRANTY SERVICE  
If non-warranty service is required, the product may be sent to the Company for repair/  
replacement, transportation prepaid, by calling 1-800-RECOTON for details, complete  
instructions, and service fee charges.  
3-foot premium digital optical cable with Toslink® connectors  
7V AC 1.4A UL Listed power supply  
Three AAA Nickel Metal Hydride (Ni-MH) rechargeable batteries  
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.  
Changes or modifications not expressly approved by the party responsible  
for compliance could void the users authority to operate the equipment.  
Features and specifications subject to change without notice.  
* Range may vary according to environment.  
 
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