Acoustic Research Headphones AW722 User Manual

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900MHz  
Wireless Headphones  
Receives signal up to 150 ft (45m)*  
Thank you for choosing the  
AR Brand 900MHz Wireless Headphones.  
Before attempting to use your headphones, please remove all parts  
from this package and read the installation and usage instructions carefully.  
* Range may vary by environment and hookup.  
AW722/AW772  
 
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HEADPHONE SET DESCRIPTION  
RECHARGING THE HEADSET  
For stand-alone functioning, your wireless headphones must be  
powered by rechargeable batteries (included). The rechargeable batteries  
must be installed into the battery compartment and recharged before  
use. (See Battery Installation and Information, page 6).  
To recharge the headset unit, place the headphones into the recharging  
cradle/transmitter with the charge indicator facing to the front.  
It is important that the headphones are placed in a completely vertical  
position, not leaning to either side. If the headphones are placed  
correctly, the charge indicator light on the headphones illuminates.  
On indicator:  
correct recharge  
position  
Off indicator:  
incorrect  
recharge  
Fine tuning control  
(AW722: knob)  
(AW772: button)  
Volume control  
On indicator  
RECHARGING CRADLE/TRANSMITTER  
On/off button  
The recharging cradle/transmitter acts both as the transmitter of the signal  
to the headphones as well as the recharging base.  
Rechargeable batteries  
BACK  
FRONT  
Charging contact  
Power on indicator  
Charge indicator  
AUDIO IN  
input jack  
Rechargeable  
Rechargeable  
battery compartment  
battery compartment  
Channel selection control 1, 2, 3  
DC IN power supply socket  
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SUPPLIED ACCESSORIES  
BATTERY INSTALLATION AND INFO (continued)  
This headphone system includes accessories that enable you to use your  
wireless headphone set in a number of ways. (See sections on Standard  
Usage, page 8, and Alternate Installation Configuration, page 9).  
Charging the Rechargeable Batteries  
Follow these steps to recharge the NiMH rechargeable batteries.  
1. Connect the AC/DC main power adapter to the DC IN  
power supply socket, located on the back of the recharging  
cradle/transmitter.  
2. Then, plug the adapter into an electrical outlet.  
3. Place the headphones into recharging cradle/transmitter, with  
the charge indicator facing to the front. Make sure the headphones  
are placed in a completely vertical position, not leaning to either  
side. If the headphones are placed correctly, the charge indicator  
light illuminates.  
Stereo Y adapter cable  
(RCA/3.5 mm jack)  
Main power adapter  
(AC/DC: 120 V ~ 60 Hz, 12 V = 200mA)  
4. Subsequent charging must be performed in about 15-17 hours.  
NiMH Rechargeable Battery Memory Effect  
When an NiMH rechargeable battery is first used, it is important to fully  
charge it and then allow it to discharge three times in order to maximize  
the battery’s storage capacity. When a battery is recharged before  
it is completely discharged, it develops a memory that will limit the  
amount of charge in the future. This reduces the battery’s storage  
capacity for subsequent charges and so reduces the amount of time  
your headphones can be used before recharging is necessary.  
3.5 mm/6.35 mm jack adapter  
Stereo cable  
(3.5 mm jacks)  
Rechargeable batteries  
(600mAH, NiMH)  
NiMH Natural Power Discharge  
Due to their chemical design, all rechargeable batteries incur some  
degree of natural discharge. This means they automatically lose their  
charge in varying degrees, even when not in use. The size of this power  
loss varies, depending on the battery’s type, size, design, internal  
resistance and, most especially, the temperature. The higher the  
temperature, the greater the power loss through natural discharge.  
BATTERY INSTALLATION AND INFORMATION  
Your wireless headphone unit requires two rechargeable AAA batteries.  
The two rechargeable batteries that are supplied with your wireless  
headphones are uncharged. Before you can use the wireless headphones,  
the batteries must be charged. Follow these steps to charge and install  
the batteries.  
NiMH Battery Warning  
Installing the Rechargeable Batteries  
1. To avoid risk of fire, explosion and injury, do not attempt to recharge  
non-rechargeable batteries.  
Take care to follow these steps to correctly charge and install the batteries.  
2. Respect the environment and the law. Before disposing of  
rechargeable batteries, ask your retailer if they can be recycled and  
whether or not the retailer collects rechargeable batteries  
for recycling.  
1. On the left earphone, locate the battery compartment and the word  
“Open.” Use your fingernail in the groove on top of the battery  
compartment to lift the cover.  
2. Insert two AAA rechargeable batteries (included), carefully following  
the markings inside to ensure the batteries are inserted properly, with  
the + and – ends in the correct positions.  
3. Replace the battery compartment cover.  
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CONNECTING THE RECHARGING  
CRADLE/TRANSMITTER  
OPERATION (continued)  
6. After selecting a channel, use the fine tuning control, located on right  
earphone to adjust the reception. The PLL function automatically  
locks the three channels, providing you with top-quality audio  
reception with no sound loss.  
Follow this quick setup guide to ensure trouble-free installation of your  
headphones. To connect the recharging cradle/transmitter to the audio  
source, follow these steps.  
7. Adjust the volume using the volume control, also located on the  
right earphone.  
1. Plug the stereo audio cable into the headphone jack of your audio  
source (e.g., stereo, TV, CD player, DVD, etc.). If your audio source  
has two RCA output jacks instead of a headphone jack, use the  
supplied Y cable to connect your headphones to the two (red and  
white) RCA jacks.  
8. When you are through using the headphones, switch them off  
using the POWER ON/OFF button, and place the audio source  
on standby.  
2. Connect the other end of the stereo audio cable to the AUDIO IN  
socket at the back of the recharging cradle/transmitter.  
Note: To ensure that your headphones are charged and ready for  
use at all times, place them in the recharging cradle/transmitter when  
not in use.  
3. Connect the AC/DC main power adapter to the DC IN power  
supply socket at the back of the recharging cradle/transmitter. Then,  
connect the adapter to an electrical outlet.  
Alternate Installation Configuration  
The accessories included with your headphone system include a jack  
adapter for connecting the unit to a 6.35 mm headphone socket and  
a Y cable. Normally, when a device is plugged into a headphone jack,  
it automatically shuts off the speakers. If you want the speakers to  
continue playing while you are using the headphone set, you can use  
the Y adapter instead of the headphone jack. Use the supplied Y cable  
to connect your headphones to the two (red and white) RCA jacks.  
Connect the other end of the stereo audio cable to the AUDIO IN input  
jack at the back of the recharging cradle/transmitter. This is especially  
useful if, for example, your family is listening to music in one room  
of your home and you want to listen to the same music in another  
room. It is also beneficial in families where one person has a hearing  
impairment. That person can use the headphones to listen to the  
audio source, adjusting the volume as needed. This type of connection  
also enables you to use your headphones more simply as you will  
only need to switch on the audio source and switch on your  
headphones to activate.  
OPERATION  
Standard usage  
1. Switch on the audio source (TV, DVD, CD player, etc.) to which the  
recharging cradle/transmitter is connected. If your audio source is  
a DVD or CD player, start a disc.  
WARNING: The recharging cradle/transmitter has an automatic  
function that switches it off if the audio input jack does not receive  
an audio signal for approximately two minutes. If the volume on the  
audio source is too low, the recharging cradle/transmitter also  
switches off after two minutes. This feature was installed to comply  
with current legislation that reduces the amount of radio emissions  
in the environment. To ensure that this function is not accidentally  
triggered, set the audio source volume at approximately 50 percent  
capacity. Consult your component user’s manual for details on how  
to set the volume for headphones/earphones.  
2. The recharging cradle/transmitter is now ready to receive an audio  
signal. The recharging cradle/transmitter is activated automatically  
when receiving an audio signal from the audio source.  
3. Check to make sure the power on indicator light on the front of the  
recharging cradle/transmitter is lit, indicating that the unit is ready.  
4. Push the POWER ON/OFF button, located on the right earphone.  
The LED light turns on to indicate activation.  
5. The recharging cradle/transmitter features three channels for radio  
frequency transmissions. Select one of these channels, using the  
switch on the back of the recharging cradle/transmitter.  
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TROUBLESHOOTING  
SPECIFICATIONS  
Refer to this troubleshooting section if you encounter any difficulties in  
setting up and using your headphones.  
Models  
AW722  
AW772  
PROBLEM  
SOLUTION  
Description  
Radio Frequency  
Wireless Headphones System  
No sound heard  
through the  
headphones  
A) Check that your audio source, recharging  
cradle/transmitter and headphones are  
connected, supplied properly and turned on.  
B) Check to ensure that the rechargeable  
batteries are installed in the headset  
Transmitter  
Carrier Frequency  
900 MHz  
Effective Range  
Power Supply  
Up to 150 feet/45 meters*  
correctly and have been recharged properly.  
C) Check to ensure the recharging cradle/  
transmitter is running and the power  
indicator light on the unit is lit.  
12 V (DC) via a 120 V–60 Hz (AC)  
main power supply adapter  
D) Check that the audio source is delivering  
a sufficient signal to the recharging cradle/  
transmitter’s AUDIO IN input jack.  
Transmission Frequency  
UHF – 900 MHz/three channels:  
911.9 MHz (1), 912.6 MHz (2)  
and 913.3 MHz (3)  
Poor sound quality  
or interference  
A) Check to ensure that the sound provided  
by the audio source is loud enough and  
of sufficient quality.  
Headset  
Power Supply  
Two AAA 1.2 V rechargeable batteries  
B) Check if the batteries in the headphones have  
sufficient power. Recharge or replace them,  
if necessary.  
* Range may vary by environment.  
C) Check to see if you have selected the best  
transmission channel (1, 2, or 3) to provide  
the optimum signal reception. If necessary,  
try another channel, remembering to fine-  
tune the reception using the tuning control.  
D) Check if the distance between the  
headphones and the recharging cradle/  
transmitter is within the operating range.  
(The effective range of this device is up to  
150 feet/45 meters from the cradle/  
transmitter.)* If out of range, move closer to  
the recharging cradle/transmitter to receive  
the sound.  
LIMITED ONE YEAR WARRANTY  
Limited One Year Warranty  
Our company (in the U.S.,THOMSON INC.) warrants that for one year  
from date of purchase, it will replace this product if found to be defective  
in materials or workmanship. For a prompt, no charge replacement of  
equivalent product, return the defective product postage prepaid to the  
appropriate address.  
Product Exchange Center  
11721 Alameda Avenue  
Socorro TX 79927  
E) Check that the audio source provides  
stereo sound.  
This replacement is the company’s sole obligation under this warranty.  
THOMSON INC. will not be responsible for any incidental or  
consequential damages or for any loss arising in connection with the  
use or inability to use this product. Some states do not allow the  
exclusion or limitation of incidental or consequential damages, so the  
above limitation or exclusion may not apply to you. This warranty  
excludes defects or damage due to misuse, abuse, or neglect. This  
warranty gives you specific legal rights, and you may also have other  
rights, which vary from state to state.  
Power cut off  
The recharging cradle/transmitter has an  
automatic power off function. When no signal  
is received for 2 minutes through the recharging  
cradle/transmitter’s AUDIO IN input jack, it  
switches off. Switch on your audio source again,  
and use the tuning control to adjust reception. If  
necessary, increase the audio source’s volume.  
* Range may vary by environment.  
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© 2006 THOMSON INC.  
10330 North Meridian Street  
Indianapolis, IN 46290 USA  
AW722/AW772  
Trademark(s) Registered  
All other brands and product names are trademarks or  
registered trademarks of their respective owners.  
 

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