Williams Sound WIR TX90 User manual

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Sound Plus™Infrared Listening System
Model WIR TX90, Two Channel System
Transmitter Model WIR TX90
Optional Receiver Models WIR RX12-4, WIR RX14-2
QUICK SETUP GUIDE
MAN 124B

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SYSTEM OVERVIEW
The WIR TX90 two channel transmitter combines infrared modulator and emitter technology into a sin-
gle mountable enclosure - reducing operating cost and eliminating precious rack space.
The WIR TX90 features an easy to use configuration control for Music, Voice, or Hearing Assistance
Applications. It operates on dual 2.3/2.8 or 3.3/3.8 MHz selectable frequencies - ideal for high quality
audio programs such as music, theater and audio description. The WIR TX90 will accept any line level,
balanced or unbalanced audio inputs, and includes adjustable tone and volume control. Infrared receivers
detect the transmission and convert the light signals back into audio signals. The 2.3-3.8 MHz operating
frequencies minimize high efficiency lighting interference.
No FCC license or radio approval is required with this equipment. It can be used anywhere in the world.
The WIR TX90 transmitter is designed to distribute its power equally among the channels sent to it for
transmission. In two channel mode, the WIR TX90 will achieve a coverage area of approximately
18,000
ft2 (1,700 m
2
)when used with the WIR RX12-4 receiver. Alternatively, it will achieve a coverage
area of 1,750 ft2(163 m2)when used with the WIR RX14-2 receiver. In single channel mode, the WIR
TX90 will achieve a coverage area of approximately 28,000 ft
2
(2,600 m
2
)when used with the WIR
RX12-4 receiver. Alternatively, it will achieve a coverage area of 3,500 ft2(325 m2)when used with the
WIR RX14-2 receiver.Larger areas can be covered with additional emitters.
Note: Coverage area will vary depending on the sensitivity of the infrared receiver being used and
reflections and absorption of the IR signal in the listening area. Infrared systems generally cannot be
used in direct sunlight because of sunlight’s overriding interfering infrared light.
Please read through this manual carefully. It includes important setup procedures and guidelines for
proper operation. If at any time you are having problems with this product, please contact Williams
Sound toll free for assistance: 800-843-3544. Outside the U.S., please call 952-943-2252.

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SETTING UP THE WIR TX90
þSTEP 1: DETERMINE COVERAGE AREA
First, determine the coverage area needed for the listening area.
Important: Coverage area will vary depending on the sensitivity of the receiver being used.
When using the optional RX12-4 receiver:one WIR TX90 transmitter will cover an area of approxi-
mately 18,000 ft2(1,700 m2)in two channel mode. In single channel mode, one WIR TX90 transmit-
ter will cover an area of 28,000 ft2(2,600 m2).
When using the optional RX14-2 receiver:one WIR TX90 transmitter will cover an area of approxi-
mately 1,750 ft2(163 m2)in two channel mode. In single channel mode, one WIR TX90 transmitter
will cover an area of approximately 3,500 ft2(325 m2).
þSTEP 2: SELECT LOCATION
The preferred location for the TX90 is above and in front of the seating area so listeners are facing the
transmitter. In cinema installations, when using the WIR RX14-2 headset receiver, the TX90 can be
mounted on the rear wall near the projector opening.
þSTEP 3: CONNECT POWER
Connect the provided power supply to the 3-pin Molex connector located on the back of the TX90
(Fig. A). The red LED “Power On” indicator will illuminate on the bottom of the TX90 (Fig B.). On
startup, the audio level indicator lights will flash eight times. This is the initialization period. After
initialization, the WIR TX90 will default to the last setting made by the user.
þSTEP 4: CONNECT AUDIO SOURCE
Determine the length of the audio cable needed to connect to the sound system to the WIR TX90 transmit-
ter. Install the supplied Phoenix connector on the end of the audio cable to be connected to the transmit-
ter. See the back of the TX90 for wiring instructions.
FIG A: Typical Two-Channel Configuration for the WIR TX90

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The WIR TX90 will accept any line level, balanced, or unbalanced audio inputs. If you wish to operate
in single channel mode, plug the audio cable with the installed Phoenix connector in “Channel A” OR the
“Channel B” connector. If you choose to operate in two channel mode, plug the audio cables with
Phoenix connectors in both “Channel A” AND “Channel B” connector. NOTE: By default, the WIR
TX90 is set to operate in two channel mode. To turn Channel A or Channel B on/off, refer to the instruc-
tions in Step 6.
þSTEP 5: SELECTING A FREQUENCY
The TX90 offers two sets of carrier frequencies for Channel A and Channel B:
2.3 and 2.8MHz or 3.3 and 3.8MHz.
The TX90 is preset to 2.3 and 2.8MHz, which are the most commonly used. Move the slide switch to
select a pair of operating frequencies.
þSTEP 6: SELECTING A CHANNEL
To activate a channel, press the “CHANNEL” button until the channel “ON” indicator lights. For exam-
ple, to operate only channel A, press the “CHANNEL” button until only the channel A “ON” indicator
lights. To operate both channel A and B, press the “CHANNEL” button until both “ON” indicators light.
Note: If you are only using one channel, make sure the other channel is turned offto maximize system
coverage.
þSTEP 7: SELECT THE AUDIO PROCESSING APPLICATION PRESET
The TX90 offers three preset audio processing options for the most common applications: Music, Voice,
and Hearing Assist. Use the “Music” setting when maximum dynamic range and audio quality are pre-
ferred. Use the “Voice” setting for simultaneous interpretation, audio description, or other applications
with users that have primarily normal hearing. Use the “Assist” setting for hearing assistance applica-
tions to meet the reduced dynamic range needs of hearing impaired listeners. You may select the same
audio preset for both channel Aand channel B, or you may select them independently.
Toselect the audio processing preset, you must first activate the channel you want to adjust. Press the
“CHANNEL” button to activate the channel(s) you want to choose an audio processing preset for, then
press the “PRESETS” button to choose the preset. The Music, Voice, or Assist indicator will light to
show your selection. After 10 seconds, the setting will be stored.
FIG B: WIR TX90 Transmitter - Bottom View

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þSTEP 8: ADJUST AUDIO INPUT LEVEL
The TX90 is designed to accept a line-level audio input signal. The “Level” indicator light for each
channel is used to help adjust the audio input level. When the indicator does not light, the input signal
level is too low. When the indicator is flashing, the signal level is optimal. When the indicator is lit, but
does not flash, the input level is too high and can cause distortion. You can adjust the input level of both
channels simultaneously, or independently.
Make sure the input audio signal is connected to the TX90. To adjust the audio input level, first activate
the channel(s) you want to adjust by pressing the “CHANNEL” button, then press the “VOLUME” but-
ton. The Volume indicator will light. Now turn the “ADJUST” knob clockwise to increase the input sig-
nal or counter-clockwise to decrease the input signal until the channel “Level” indicator is flashing.
After 10 seconds, the setting will be stored.
** IMPORTANT **
Audio level NORMAL (optimal): the audio indicator level will flash at a 1 second rate.
Audio level too HIGH: the audio indicator level will stay on or flash erratically.
Audio level too LOW: the audio indicator level will be off.
þSTEP 9: ADJUST TONE
The TX90 has a tone adjustment to suit user preference and to compensate for the different frequency
responses of various infrared receiver models. First, make sure the audio source is active. Use a receiver
from the system to listen to the signal as you adjust the tone control.
Toadjust the tone, first activate the channel(s) you want to adjust by pressing the “CHANNEL” button,
then press the “TONE” button. The tone indicator will light. Now turn the “ADJUST” knob clockwise to
emphasize high frequencies (best for hearing assistance use). When you have reached the maximum
adjustment, there will be no further change in tone. Turn the “ADJUST” knob counter-clockwise to
decrease the high frequency emphasis. When you have reached the minimum adjustment, there will be
no further change in tone. After 10 seconds, the setting will be stored.
SIGNAL
1K F (Hz)
TONE
MAX CLOCKWISE
SIGNAL
1K F (Hz)
TONE
MAX COUNTERCLOCKWISE
FIG C
Turn knob clockwise boosts the highs
and cuts the lows Turn knob counterclockwise boosts the
lows and cuts the highs

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SETTING UP THE WIR RX12-4 RECEIVER (OPTIONAL)
Make sure the two “eyes” located on the front label of the receiver (Fig. D) are not covered up when in
use. Do not place the receiver in a pocket or purse or it will not work properly. A variety of earphones,
headphones, or a neckloop telecoil coupler can be used with the RX12-4 Receiver.
STEP 1: To install the batteries, open the battery compartment using a coin in the slot in the bottom
of the receiver. Press two AA batteries into place, observing proper battery polarity.
STEP 2: Plug the earphone or headphone into the earphone jack.
STEP 3: Turn the receiver on by rotating the volume control knob to the right.
STEP 4: Select a listening channel (1-4) by rotating the channel control knob. Important: Make sure
the receiver frequency matches the transmitter frequency!
To avoid draining the battery, make sure the receiver is turned off when not in use. The
“on” indicator LED will flash to indicate a low battery.
RX12-4 Front View
4channel
IR
Williams Sound
Infrared "Eye"
Charging
Contacts
RX12-4 Top View
EAR
On
Volume
Channel
OFF
1234
Earphone 
Jack
Volume/Off 
Control Knob
On LED
Indicator
Channel Selector
Rotator Knob
FIG. D1 FIG. D2 Channel Frequency
12.3 MHz
2 2.8 MHz
3 3.3 MHz
4 3.8 MHz
EXPECTED BATTERY LIFE:
This receiver comes standard with disposable AA Alkaline batteries (BAT 001). Rechargeable AA NiMH
batteries (BAT 026) may also be used (not included).
AA Alkaline Batteries: 60 hours
AA NiMH Rechargeable Batteries: 30 hours/charge.
Note: Batteries from other suppliers may provide different operating life.

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RX14-2 Front View
SETTING UP THE WIR RX14-2 RECEIVER (OPTIONAL)
STEP 1: Turn the receiver’s Power Switch to ON
STEP 2: Place the headset on your head and adjust the headband size by pulling or pushing on each
earpiece.
STEP 3: Locate and adjust the individual volume controls for a comfortable listening level.
STEP 4: Choose between 2.3 MHz or 2.8 MHz operation by pressing the frequency selector button
on the left earphone. Important: Make sure the receiver frequency matches the transmitter
frequency!
BATTERY INSTRUCTIONS
This receiver comes standard with disposable AAA Alkaline batteries (BAT 010). Rechargeable AAA
NiMH batteries (BAT 022) may also be used (not included).
EXPECTED BATTERY LIFE
BAT 010 AAA Alkaline batteries 50 hours
BAT 022 AAA NiMH batteries 8 hours per charge
Note: Batteries from other suppliers may provide different operating life.
FIG: E FIG: F

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TROUBLE SHOOTING
THE WIR TX90 “POWER ON”INDICATOR IS NOT LIT.
˛Make sure the transformer is plugged into the transmitter and any remote power switch is on.
˛Make sure the electrical outlet is on.
˛Make sure the 24 VAC power supply is working.
THE WIR TX90’SCHANNEL AOR B “ON”INDICATOR ISNOT LIT.
˛Make sure the desired audio channel has been activated. See “Selecting a Channel” on Step 6.
˛Make sure the WIR TX90 is plugged in.
˛Make sure the audio input is connected properly. See Fig. A.
˛Make sure an active audio signal is being sent to the WIR TX90 transmitter.
NOSOUND THROUGH RECEIVERS.
˛Check to make sure the receiver is operating on the same frequency as the transmitter.
˛If some of the receivers work but others don’t, check for bad batteries or earphones on the receivers
that aren’tworking.
˛If none of the receivers work, check to see if the power and audio input cable are connected to the
transmitter and that the WIR TX90 “Power On” and Channel A or B “On” indicator is illuminated.
˛Check to see if the transmitter is connected properly to the sound system. The audio level indicators
should flash on channels that are selected.
˛Make sure the “eye” is not covered up on the receiver. There must be clear line of sight between the
receiver eye and the transmitter panel.
SOUND THROUGH THE RECEIVERS ISWEAK AND NOISY.
˛Listen to the audio signal through the headphone jack on the WIR TX90 transmitter (Fig. B). If
the signal is weak and noisy here, try increasing the audio input level (see Step 8), or increase the
input signal level from the sound system by turning up the mixer control. If the signal sounds
okay, you may need to re-position the transmitter panel or add additional IR emitters to the TX90
system.
NOTE: Make sure the powerline voltage does not fall below 90V, or system performance will be
greatly reduced!
BUZZING ORHUMMING NOISE INSOUND SYSTEM.
˛Check for ground loops or noise on the input signal. Call your Authorized Williams Sound dealer or
representative.