Williams Sound SoundPlus Infrared System WIR TX925 User manual

WIR TX925, WIR SYS 1
Two-Channel Infrared Listening Systems
USER MANUAL
Emitter Model WIR TX9 DC
Modulator Model MOD 232
Optional Receiver Models WIR RX18, WIR RX22-4
WIR TX9 DC EMITTER
MOD 232 MODULATOR
WIR RX18 RECEIVER WIR RX22-4 RECEIVER
MAN 210B

IWIR TX925, WIR SYS 1 Infrared Listening Systems
2
Table of Contents
System Overview........................................................................................................................................................................................ 3
MOD 232 Modulator Setup ..................................................................................................................................................................... 3
Determine Location .......................................................................................................................................................................... 3
Wiring and Connections................................................................................................................................................................... 3
Power Connection for U.S. Application ....................................................................................................................................... 4
For Applications Outside The U.S. Requiring 240 VAC Mains Supply:............................................................................. 4
Baseband Cable Connection ......................................................................................................................................................... 4
Audio Connection...............................................................................................................................................................................5
Features and Controls ......................................................................................................................................................................6
Configuration Settings ......................................................................................................................................................................6
TX9 DC Emitter Setup ............................................................................................................................................................................... 8
TX9 DC Location and Placement .................................................................................................................................................. 8
Coverage Area ............................................................................................................................................................................................8
Multiple Emitters Installed to Maximize Coverage...................................................................................................................9
Compressor Gain...............................................................................................................................................................................10
WIR TX9 DC Features and Controls.....................................................................................................................................................11
Mounting the WIR TX9 DC...............................................................................................................................................................11
Receiver Safety Information ...................................................................................................................................................................12
Recycling Instructions...............................................................................................................................................................................12
Infrared Receivers......................................................................................................................................................................................13
Specifications - WIR TX9 DC..................................................................................................................................................................13
Specifications - MOD 232.......................................................................................................................................................................14
Troubleshooting .........................................................................................................................................................................................15
TX9 DC Indicator Light Is Not On.................................................................................................................................................15
Only TX9 DC’s Power Indicator LED Comes On.....................................................................................................................15
No Sound Through Receivers.......................................................................................................................................................15
Sound Through The Receivers Is Weak And Noisy. ..............................................................................................................15
Buzzing Or Humming Noise In Sound System. .......................................................................................................................15
Limited Warranty ........................................................................................................................................................................................15

IWIR TX925, WIR SYS 1 Infrared Listening Systems
3
System Overview
The Williams Sound SoundPlus®Infrared Listening System consists of a MOD 232 Modulator(s) and one or more TX9
Emitters which use invisible infrared (IR) light to broadcast speech or music to wireless infrared receivers.
The system is designed to transmit high quality audio for hearing assistance and language translation applications.
Because the system uses infrared light for transmission, it is not aected by interference from radio equipment and
does not interfere with radio equipment. No FCC license or radio approval is required.
The system can be used with microphones as a stand-alone system, or can be connected to other sound equipment.
Infrared systems generally cannot be used in direct sunlight because of sunlight’s large amount of interfering infrared
light.
Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this equipment in a residential area is likely
to cause harmful interference in which case the user will be required to correct the interference at his own
expense.
NOTICE: A plasma monitor can degrade the audio quality of the SoundPlus®Infrared Listening System.
MOD 232 Modulator Setup
Determine Location
The modulator is usually located with the sound system amplifier or mixer for easy access to an audio input signal.
For portable systems, the modulator can be placed near the emitter or in another convenient location. Infrared Stand
Kit SS-6 is available for portable systems.
Wiring and Connections
MOD 232 (Rear View)
A255
INPUT CH A CH B
ACCEPTS ANY LOW
IMPEDANCE MICROPHONE
OR LINE LEVEL SIGNAL.
BASEBAND OUTPUT
SENDS INDIVIDUAL
AND/OR COMBINED
CARRIER FREQUENCIES
OF 2.3, 2.8, 3.3, 3.8 MHz
TO A TX9 EMITTER.
AUDIO LINE OUTPUT
RCA JACK FOR MONITORING,
RECORDING, OR ROUTING
PROCESSED AUDIO TO
ANOTHER SOUND SYSTEM.
POWER IN
24 VAC, 50-60Hz
120 VAC (US); TFP 016 POWER SUPPLY
230 VAC (CE); TFP 027 POWER SUPPLY
CONFIGURATION SWITCHES
CONTROLS CHANNEL SELECTION,
COMPRESSOR GAIN, MIC/LINE
INPUT, CHANNEL ON/OFF, AND
OTHER CONTROLS.
BASEBAND INPUT
A SECOND MODULATOR
MAY BE CONNECTED
HERE FOR 4 (FOUR)
CHANNEL OPERATION.

IWIR TX925, WIR SYS 1 Infrared Listening Systems
4
Power Connection for U.S. Application
1. Connect the TFP 016 power supply to the 3-pin Molex connector located
on the rear of the MOD 232.
For Applications Outside The U.S. Requiring 240 VAC Mains Supply:
Use the transformer power supply, model TFP 027. Secondary specifications:
24 VAC, 35 VA, 50/60 Hz.
2. Plug the power supply into the AC outlet.
Baseband Cable Connection
The MOD 232 can directly drive one or two emitters. TX9 DC emitters repeat the baseband signal, so any number of
emitters can be used. The modulator outputs CANNOT be split with CATV splitters.
Determine the length of RG-58 cable needed to reach from the TX9 DC Emitter to the Modulator unit. Install BNC
connectors to each end of the cable.
For two-channel operation, only one MOD 232 is required: Connect the coaxial cable to one of the Baseband Output
jacks on the rear of the MOD 232. The other end of the coaxial cable connects to the Baseband Input jack of the
TX9 DC Emitter.
Baseband Connection, Two Channel Operation
MOD 232 MODULATOR (REAR)
SECOND WIR TX9 EMITTER (OPTIONAL)
TX9 BASEBAND INPUT TX9 BASEBAND INPUT
BASEBAND
OUTPUT
BASEBAND
OUTPUT
A639
WIR TX9 EMITTER (REAR)
Connect to the TX9 DC using RG-58 cable and BNC connectors. The MOD 232 has two baseband output jacks to
simplify connections when multiple emitters are used.
To setup a system for four-channel operation, two MOD 232 Modulators are required. Link the two Modulator units
together as shown. Connect the baseband output from the second modulator in the chain to the TX9 DC emitter(s)
baseband input connector.
Power Connection
POWER
SUPPLY
(Molex
plug)
A640

IWIR TX925, WIR SYS 1 Infrared Listening Systems
5
Baseband Connection, Four Channel Operation
MOD 232 MODULATOR #2 (REAR)MOD 232 MODULATOR #1 (REAR)
COAXIAL CABLE (WCA 068) TX9 BASEBAND INPUT
BASEBAND
OUTPUT
BASEBAND
OUTPUT
BASEBAND
INPUT
A249
IMPORTANT: Each channel must be set to a dierent frequency!
Audio Connection
Microphone Input:
With the modulator DIP switches set for microphone input, the 3-pin XLR jack accepts balanced microphones.
Power for condenser microphones can be selected by DIP switch. The minimum input level is 100 µV and the
maximum level is 90 mV.
XLR Line-Level Input:
With the modulator DIP switches set for line-level input, the 3-pin XLR jack accepts balanced line-level audio
inputs. The minimum input level is 21 mV and the maximum level is 10 V.
1/4” TRS Line-Level Input:
The 1/4” Tip/Ring/Sleeve (TRS) jack can accept only a balanced or unbalanced line-level input. A 25 V, 70 V, or 100
V speaker line can be connected to the balanced line input using an appropriate attenuator. “T” pads made with
resistors yield better fidelity than speaker matching transformers.
Audio Connection
BALANCED LINE USING 3–PIN CONNECTOR
IN PHASE
1 2
3
3 PIN CONNECTOR
A108
UNBALANCED LINE USING 3–PIN CONNECTOR
1 2
3
3 PIN CONNECTOR
A105
BALANCED LINE USING 1/4" CONNECTOR
IN PHASE
A106
UNBALANCED LINE USING 1/4" CONNECTOR
A107

IWIR TX925, WIR SYS 1 Infrared Listening Systems
6
Features and Controls
Features and Controls (MOD 232 Rear)
A254
COMPRESS CONTROL
2:1 SETTING WILL
INCREASE TRANSMITTED
AUDIO UP TO 30 dB
DURING PERIODS OF
LOW LEVEL SOUND.
INPUTS MIXED
INDICATES CHANNEL
A AND CHANNEL B
ARE MIXED AND
TRANSMITTED
BY CHANNEL A.
CHANNEL B IS OFF.
STEREO LED
INDICATES
STEREO MODE.
AUDIO LEVEL
CONTROLS
POWER SWITCH
TURNS THE MODULATOR
ON AND OFF. THE WALL
MOUNTED POWER SUPPLY
STAYS ON AT ALL TIMES.
LEVEL INDICATORS
INDICATOR SHOWS
AUDIO LEVEL IN 3dB
INCREMENTS.
IR LED
FOR TESTING
RECEIVERS.
PHONE SWITCH
SELECTS CHANNEL
A OR B AUDIO
WHEN NOT IN
STEREO MODE.
PHONE JACK
1/4” PHONE JACK.
MONITORS CHANNEL
A OR B STEREO AUDIO
DEPENDING ON
POSITION OF PHONE
JACK SWITCH, AND
MODE OF OPERATION.
POWER ON
INDICATOR
CARRIER (CXR) LEDs
INDICATES SELECTED
FREQUENCY, FLASHES
TO INDICATE A FAULT.
Configuration Settings
The configuration chart (next page) illustrates how to configure your system using the DIP switches located on
the back of the MOD 232 Modulator. This chart is also printed on top of the MOD 232 Modulator unit for quick
reference.
Configuration DIP Switches
CHANNEL A AND B
CONFIGUREATION
SWITCHES
A252

IWIR TX925, WIR SYS 1 Infrared Listening Systems
7
DIP Switch Configuration Chart
A250
IMPORTANT: Channel A and Channel B must be set to dierent frequencies!
Compressor Gain
The MOD 232’s Compressor Gain is set in “Moderate” mode from the factory. Use this setting for simultaneous
interpretation. Be sure that the compress control, located on the front of the MOD 232, is turned fully counter-
clockwise. Compression can be added if desired by turning the compress control clockwise.
For hearing assistance applications, the MOD 232’s Compressor Gain can be set to “Maximum” mode. For additional
compression, use a tuning wand (PLT 005) or small screw driver and gently turn the compress control on the front of
the MOD 232 clockwise.TX9 DC Emitter Setup

IWIR TX925, WIR SYS 1 Infrared Listening Systems
8
TX9 DC Emitter Setup
TX9 DC Location and Placement
To determine the best location for the TX9 DC Emitter, it helps to think of the IR emitter as an invisible floodlight. You’ll want
to aim it so the listeners are “flooded” with the infrared light. Mount the emitter at least 2 ft (0.61 m) above the audience.
Position the emitter to face in a slightly downward angle - that will increase the “throw” of the infrared beam. Infrared
light reflects o most surfaces and scatters, increasing the coverage area. Rough surfaces tend to absorb infrared light,
minimizing reflections, and limiting coverage to the direct illumination. Remember: opaque objects block infrared light.
Thus, emitters cannot be concealed behind opaque walls, curtains, etc.
The emitter front red plastic lens must NOT be painted. Neither should emitters be used in areas of extreme high or low
temperature, humidity, or chemical environments.
The TX9 DC Infrared Emitter should not be installed where there is a lot of direct sunlight, which can create infrared interference.
3-Dimensional Foot Pattern When pointing the emitter, be sure to keep the long dimension horizontal.
A237
CORRECT
INCORRECT
A230
CORRECT
INCORRECT
A230
Coverage Area
Maximum Range when using the RX22-4 or RX18 receiver
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
10
20
30
40
50
60
70
80
90
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
160
FEET
FEET
RX22-4 RECEIVER
RX18 RECEIVER
RECEIVER COVERAGE AREA WITH
TX9 DC OR TX90 DC TRANSMITTER
IN SINGLE-CHANNEL MODE
A627
0
0
-3
-6
-9
-12
-15
-18
-21
-24
-27
3
6
9
12
15
18
21
24
27
3 6 9 12 15 18 21 24 27 30 33 37 40 43 46 49
METERS
METERS
RX22-4 RECEIVER
RX18 RECEIVER
RECEIVER COVERAGE AREA WITH
TX9 DC OR TX90 DC TRANSMITTER
IN SINGLE-CHANNEL MODE
A627b
These patterns are the direct radiation pattern. The infrared radiation does not drop to zero outside the illustrated
patterns; it decreases. It still may be useable at a greater distance, depending on the receiver sensitivity and the reflective
characteristics of the room. Reflections of the infrared light from walls, ceilings, and floors may change these patterns.

IWIR TX925, WIR SYS 1 Infrared Listening Systems
9
Multiple Emitters Installed to Maximize Coverage
Overlapping Illumination Patterns to Cover Larger Listening Areas
WIR TX9 DC WIR TX9 DC
WIR TX9 DC WIR TX9 DC
A636
Single Coverage Pattern with one or two emitters
WIR TX9 DC
COVERAGE AREA
WITH SINGLE EMITTER
COVERAGE AREA
WITH SECOND EMITTER
ADDED TO SAME
EMISSION POINT
(50% INCREASE)
WIR TX9 DC
A635
Connecting Multiple TX9 DC Emitters
An unlimited number of WIR TX9 DC emitters can be daisy-chained together to maximize the coverage area.
Each emitter needs its own power supply and cannot share a power supply with a modulator or another emitter.
MOD 232 MODULATOR (REAR)
TO SECOND TX9 EMITTERTO THIRD TX9 EMITTER TO TX9 EMITTER
BASEBAND
OUTPUT
BASEBAND
INPUT
WIR TX9 EMITTER #3 (REAR)
TO ADDITIONAL
EMITTERS
TO ADDITIONAL EMITTERS
WIR TX9 EMITTER #2 (REAR) WIR TX9 EMITTER #1 (REAR)
A634
BASEBAND
OUTPUT
BASEBAND
INPUT
BASEBAND
OUTPUT
BASEBAND
OUTPUT
BASEBAND
INPUT
BASEBAND
OUTPUT

IWIR TX925, WIR SYS 1 Infrared Listening Systems
10
Compressor Gain
The MOD 232’s Compressor Gain is set in “Moderate” mode from the factory. Use this setting for simultaneous
interpretation. Be sure that the compress pot control, located on the front of the MOD 232, is turned fully
counter-clockwise. Compression can be added if desired by turning the compress pot control clockwise.
For hearing assistance applications, the MOD 232’s Compressor Gain can be set to “Maximum” mode. For
additional compression, use a tuning wand (PLT 005) or small screw driver and gently turn the compress pot on
the front of the MOD 232 clockwise.
The dierence between “Moderate” and “Maximum” Compressor Gain is illustrated below:
Compressor Gain Chart
A251
2
:
1
COMPRESSION RATIO, MAX GAIN
2:1 COMPRESSION RATIO, MODERATE GAIN
1
:
1
C
O
M
P
R
E
S
S
I
O
N
R
A
T
I
O
,
M
A
X
O
R
M
O
D
E
R
A
T
E
G
A
I
N
To setup the MOD 232 for “Moderate” Compressor Gain: Place switch 1 in the £“on” position.
To setup the MOD 232 for “Maximum” Compressor Gain: Place switch 1 in the ¤“o” position.