The WIR TX900 is a high performance, cost-effective infrared
system designed for simultaneous language interpretation of up
to four languages. Operating on 2.3-3.8 MHz, the WIR TX900
is less susceptible to traditional radio and lighting interference.
When using the optional RX22-4 four-channel receiver, the WIR
TX900 will operate up to 28,000 ft2 in single channel mode, ideal
for auditoriums, theaters or other large venues.
8.5” W x 8.2” D x 1.7” H (21.5 cm x 20.8 cm x 4.4 cm), 3.1 lbs (1.5 kg)
Black epoxy paint with white legends
1/2 rack space wide, 1 rack space high, one or two modulators may be mounted in a single IEC rack space
with RPK 005 (single) or RPK 006 (double) Rack Mount Kits
Wall Transformer, 24 VAC, 50-60 Hz, 15 VA
North America: TFP 016, UL/CSA
Europe: TFP 027-01, 2-pin Schuko plug, CE
UK: TFP 027-02, 3-pin UK plug, CE
30 to 16,000 Hz, +1 dB, -3 dB, electrical response
Less than 2%, electrical response
Compression (slope) adjustable 1:1 or 2:1
Switchable compression gain: Moderate: 16 dB. Max: 33 dB
15 minute timer shuts off carrier when no audio is present (can be disabled)
Two-position push button, ON/OFF
Green LED
CH A and CH B Input Level, rotary knobs
CH A and CH B Audio Level, 10-segment LED’s
4 green LED carrier “on” indicators per channel (indicates frequency, malfunctions)
1:1 or 2:1
Indicates inputs A and B audio are mixed and transmitted by CH A, CH B off
Indicates stereo mode
Selects CH1 or CH2 for phones when not in stereo mode
Fig. 1: MOD 232 Front Panel
Page 3
SoundPlus® Infrared System
Fig. 2: MOD 232 Rear Panel
Input CH AInput CH B
Made in USA
Phones Output:
Infrared Test LED:
Power Input:
Audio Input Jack:
Mic Level:
Line Level:
Audio Line Output Jacks:
Conguration Switches:
Baseband Input Jack:
Baseband Output Jack:
Approvals:
Operating Requirements:
Warranty:
1/4” TRS headphone jack. Accepts stereo, mono, and any impedance phones.
IR LED for receiver testing, monitoring, and audio signal testing
3-Pin Molex, 24 VAC, 50-60 Hz, 15 VA
CHA and CHB combination XLR/TRS jack
Balanced, Lo-Z, 100 µV min. to 90 mV max., 1mV nominal, 3 kΩ input impedance, supplies switchable simplex power
per DIN 45596 for condenser mics
Balanced or unbalanced, 21 mV min. to 10V max., 212 mV nominal, 100 kΩ
RCA Jack, CHA and CHB, 500 mV, unbalanced, 100 Ω source impedance, load impedance must be greater than 1 kΩ
CHA and CHB 8-position DIP switch, selects Mic/Line input, compressor gain, simplex power, discrete or mixed inputs,
carrier frequency, channel disable, auto shut-off timer
BNC, allows mixing with additional MOD 232 Modulator (4CH operation), 100 mV, 50 Ω input impedance, use with MOD
232, BNC, RG-58 Cable
Two BNC jacks carry baseband signal, 100 mV/channel, 50Ω source impedance, for use with WIR TX9 or MOD 232
only
CE, FCC, RoHS, WEEE
0-50º C ambient temperature, non-condensing, non-corrosive atmosphere
5 years on modulator, 90 days on accessories
12345678
CH A
12345678
CH B
Configuration
Switches
Audio Line
Output
CH A
CH B
100 Ohms
MOD 232 Infrared System Modulator
Baseband
Input
OutputOutput
50 Ohms
Williams Sound
Power In
24 VAC, 15 VA, 50-60 Hz
Plug
24V
WIR TX9 Emitter:
Dimensions, Weight:
Power Supply:
Power Cable:
Indicators:
Carrier Frequency:
Emitter IR Power:
Coverage Area:
Baseband Input:
Baseband Output:
Baseband Cable:
Operating Requirements:
Mounting Kits:
Warranty:
Approvals:
Compatible Receivers:
11.25” W x 6.25” H x 2.125” D (28.6 cm x 15.9 cm x 5.4 cm), 1.9 lbs (0.9 kg)
Color:
Black with white legends, red acrylic lens (Enclosure available in white with clear or frosted lens)
NEC Class 2 wiring, two-conductor, 18 ga., 200’ (61m) max. length
Green LED power indicator, red LED baseband indicator
50 kHz to 8 MHz
3.5 watts
Up to 28,000 ft2 (2,600 m2) in single-channel mode when using the RX22-4 Receiver
Up to 11,000 ft2 (1,021 m2) in four-channel mode when using the RX22-4 Receiver
Up to 10,000 ft2 (929 m2) in single-channel mode when using the RX18 Receiver (See coverage area diagrams)
BNC, 100 mV per carrier, 50Ω, for use with WIR TX9 or MOD 232 only
BNC, 50 Ω, for use with TX9 only
RG 58 Coax, BNC connectors, maximum 1000’ (300m) length
0-50º C ambient temperature, non-condensing, non-corrosive atmosphere
Wall or Ceiling Mount: BKT 024 Omnidirectional mount, Mic Stand Kit: SS-11 or SS-6
5 years on emitter, 90 days on accessories
CE, FCC, RoHS, WEEE
WIR RX22-4 Four-Channel Receiver
WIR RX18 Two-Channel Receiver
WIR RX15-2 Two-Channel Receiver
Page 4
Feet
SoundPlus® Infrared System
Multi-Channel Infrared Transmitter
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: TO REDUCE THE RISK OF FIRE OR
Class 1
ELECTRIC SHOCK DO NOT EXPOSE THIS
LED Product
Note: It is normal for this unit to feel warm while it is in operation.
Power Supply Wiring:
Baseband Signal Wiring:
Use RG58 Coax,1000 ft. (350m) max. length
Williams Sound, Minneapolis, Minnesota, USA
Patent Pending
Power In:
50-60Hz
EQUIPMENT TO RAIN OR MOISTURE.
Use NEC, Class 2 Wiring, 18 ga. minimum,
200 ft. (70m) maximum length (18 ga.)
24 VACNC
24VAC
35VA
~
Plug
Fig. 3: WIR TX9 Rear Panel
90
80
70
60
50
40
30
20
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
Feet
0
10
20
30
RoHS
Mounting
Bracket
Made in U.S.A.
Power OnBaseband On
RX18
90 100 110 120 130 140 150 160
80
70
60
50
40
www.williamssound.com
Baseband Signal Wiring:
Use 50 Ohm Coaxial Cable (RG58)
RX22-4
Baseband
(Modulation)
InOutOut
50 Ohms
Receiver Coverage Area with TX90
Transmitter in Single Channel Mode
RX22-4 Receiver
RX15-2 Receiver
RX18 Receiver
Fig. 4: Receiver Coverage Area with TX9 Emitter in Single Channel Mode
The coverage area for the TX9 will vary depending on the receiver being used. The diagram above demonstrates the receiver coverage
when operating a single TX9 emitter in single channel mode. Patterns are direct radiation patterns.
Note: Reections of the infrared light from walls, ceilings and oors may change these patterns.
Page 5
Earphone
Channel
SoundPlus® Infrared System
WIR RX22-4 Receiver
Selector Knob
OFF
On/Off
Volume Switch
Jack
"On"
Indicator LED
RX22-4 Top
Receiver Style:
Size:
Weight:
Color and Material:
Lanyard:
Operating Temperature:
Battery Type:
Battery Life:
Battery Drain:
Charging Contacts:
Carrier Frequency:
De-Emphasis:
FM Deviation:
Signal-to-Noise Ratio:
Squelch:
Frequency Response:
Total Harmonic Distortion:
Controls:
Indicators:
Audio Output Jacks:
Audio Output Power:
Acoustic Output:
Sensitivity:
Approvals:
Warranty:
Compatible Headphones/
Earphones:
Compatible Headphones/
Earphones:
Body-Pack, dual-lens detector, lanyard
4.5” L x 2.85” W x 1.2” H (114.3 mm x 72.4 mm x 30.4 mm)
4.6 oz (130 g) with batteries
Black
3 ft (.91 m), allows receiver to be worn around the neck
Red LED “ON” indicator, ashes to indicate Low battery
3.5 mm stereo mini phone jack
Accepts 3.5 mm mono or stereo phone plug
15 mW max at 32 Ω
110 dB SSPL90 w/ EAR 013
Better than 1 nW/cm2 for 40 dB signal-to-noise ratio
CE, FCC, RoHS, WEEE
5 years on receiver, 90 days on accessories
Mono or stereo, 8-32 ohms, 3.5 mm mini phone plug, HED 021, HED 026,
EAR 013, EAR 014, EAR 022, NKL 001
Mono or stereo, 8-32 Ω, 3.5 mm mini phone plug, HED 021, EAR 013, EAR
014, EAR 022
RX22-4 Front
Fig. 9: WIR RX22-4 Receiver
Page 6
WIR TX9 Emitter (rear)WIR TX9 Emitter (rear)
SoundPlus® Infrared System
Four-Channel System Diagram
Multi-Channel Infrared Transmitter
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: TO REDUCE THE RISK OF FIRE OR
Class 1
ELECTRIC SHOCK DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE.
LED Product
Note: It is normal for this unit to feel warm while it is in operation.
Power Supply Wiring:
Use NEC, Class 2 Wiring, 18 ga. minimum,
200 ft. (70m) maximum length (18 ga.)
Baseband Signal Wiring:
Use RG58 Coax,1000 ft. (350m) max. length
Williams Sound Corp., Minneapolis, Minnesota, USA
Patent Pending
24 VACNC
Power In:
24VAC
~
Plug
50-60Hz
35VA
Power OnBaseband On
Made in U.S.A.
RoHS
Mounting
Bracket
www.williamssound.com
Baseband Signal Wiring:
Use 50 Ohm Coaxial Cable (RG58)
Baseband
(Modulation)
InOut Out
50 Ohms
Multi-Channel Infrared Transmitter
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: TO REDUCE THE RISK OF FIRE OR
Class 1
ELECTRIC SHOCK DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE.
LED Product
Note: It is normal for this unit to feel warm while it is in operation.
Power Supply Wiring:
Use NEC, Class 2 Wiring, 18 ga. minimum,
200 ft. (70m) maximum length (18 ga.)
Baseband Signal Wiring:
Use RG58 Coax,1000 ft. (350m) max. length
Williams Sound Corp., Minneapolis, Minnesota, USA
Patent Pending
24 VACNC
Power In:
24VAC
~
Plug
50-60Hz
35VA
Power OnBaseband On
To Additional
Emitters (if necessary)
MOD 232 Modulator (Rear)
MOD 232 Infrared System Modulator
Input CH A Input CH B
Made in USA
CHA
Audio In
Audio In
CH A
CH B
12345678
12345678
Configuration
Switches
CHB
CH A
CH B
Audio Line
Output
100 Ohms
Williams Sound
Baseband
OutputOutputInput
Power In
24 VAC, 15 VA, 50-60 Hz
50 Ohms
Baseband Signal
Plug
24V
CHA
Audio InWCA 068
Baseband Signal
MOD 232 Modulator (Rear)
Input CH A Input CH B
Made in USA
CH A
CH B
12345678
12345678
Configuration
Switches
CH A
CH B
Audio Line
Output
100 Ohms
Baseband
50 Ohms
MOD 232 Infrared System Modulator
CHB
Audio In
Made in U.S.A.
RoHS
OutputOutputInput
Williams Sound
Power In
24 VAC, 15 VA, 50-60 Hz
Mounting
Bracket
Plug
24V
www.williamssound.com
Baseband Signal Wiring:
Use 50 Ohm Coaxial Cable (RG58)
Baseband
(Modulation)
InOut Out
50 Ohms
SOUND SYSTEM
Fig. 10: Four-Channel System
SOUND SYSTEM
RX22-4 Receiver
(wireless)
Page 7
SoundPlus® Infrared System
Bid Specs:
Modulator, Model MOD 232
The infrared system shall consist of separate modulator and emitter units, with portable receivers. The modulator unit shall be a half-rack
style, metal enclosure. A rack panel shall be available to mount one or two modulator units within a single EIA rack space. An adjustable
oor stand and mounting bracket shall be available to mount the modulator and emitter together for portable operation.
The modulator shall provide two channels of selectable FM carrier signals; 2.3/2.8/3.3/3.8 MHz, so that a single modulator can be used
to simultaneously transmit up to two channels, and two modulators can be linked together to transmit up to four channels simultaneously.
The carrier signals shall use 50 kHz deviation and 50 µS pre-emphasis. The carrier signals (baseband) shall be transmitted to one or more
emitters by 50 ohm RG58 coaxial cable with BNC-type connectors. A BNC–type baseband input jack and baseband output jack shall be
provided on the modulator. The modulator shall be powered by an external 24 VAC, 10 VA, 50-60 Hz power supply, connected via a threepin Molex power connector.
It shall have a rocker-type power switch, power LED indicator, four carrier indicator LEDs and two bar graph-type LED audio indicators. The
modulator shall have a modulated IR LED on the front panel for testing purposes, and a headphone jack that accommodates mono and
stereo 1/4” headphones, and channel monitoring switch. The modulator shall have two rotary audio input level controls, and a screwdriver
adjustable control for varying the input compression from 1:1 or 2:1. The modulator shall have two timers that automatically shut off the
carriers when there is no audio signal present for 15 minutes. The modulator shall have two combination input jacks that accept 3-pin XLR
plugs for balanced microphone input or 1/4” TRS plugs for balanced or unbalanced line-level inputs. The XLR inputs shall be low
impedance, accept signal levels from 100 µV to 90 mV and supply 15 V simplex power per DIN45596. The TRS jacks shall accept balanced
or unbalanced audio signal levels from 21 mV to 10 V. The modulator shall have CE, FCC, RoHS, and WEEE approval and carry a ve-year
parts and labor warranty.
The modulator shall be the Williams Sound model MOD 232.
Emitter, Model TX9
The emitter shall be contained in a metal enclosure with a shatter-resistant lens. The emitter shall include an omni-directional mounting
bracket for permanent installation and a bracket shall be available for mounting on a oor stand for portable installations. Each emitter
shall be powered by a 24 VAC, 50 VA, 50-60 Hz power supply. The power connector shall be a 3-pin Molex-type. The emitter shall have a
BNC-type 50 ohm baseband input and a BNC-type baseband 50 ohm output jack. The emitter shall have a repeater circuit to allow multiple
numbers of emitters to operate from the baseband signal. The emitter shall have a visible LED indicator for power and for baseband signal.
Carrier frequency is 50KHz to 8 MHz. The emitter shall shut off when the baseband signal is not present. The emitter shall provide an
effective coverage area of up to 28,000 sq ft (2,600 sq m) in single channel mode and up to 18,000 sq ft (1,700 sq m) in two channel mode
when using the RX22-4 receiver. The emitter shall provide an effective coverage area of up to 10,000 sq ft (929 sq m) in single channel
mode when using the RX18 receiver.The emitter shall be convection-cooled, without fans. The emitter shall have CE, FCC, RoHS, and
WEEE approval and carry a ve-year warranty on parts and labor.
The emitter shall be Williams Sound model WIR TX9.
Four-Channel Receiver, Model RX22-4
The receiver shall be a body-pack type with IR detector lens behind face of the unit. The unit shall have a lanyard for hands-free operation.
The receiver shall have a rotary-type volume control. The receiver shall operate for 60 hours with two AA alkaline batteries and for 30 hours
per charge with NiMH AA batteries. The receiver shall be charged without battery removal via charger contacts in the case. A drop-in
charger accessory shall recharge the batteries in 8 hours when used with CHG 3512 charger. The receiver shall be housed in an impact
resistant plastic case with a hinged battery door that does not separate from the receiver. The receiver shall receive 2.3 MHz, 2.8 MHz, 3.3
MHz or 3.8 MHz modulated IR signals with 50 µS de-emphasis. The receiver shall have a 3.5 mm stereo phone jack and accommodate
low-impedance mono or stereo earphones and headphones. The receiver shall accommodate neckloop telecoil couplers. The receivers
shall provide 110 dB SSPL90 output with EAR 013 earbud-type earphone.
The system electrical frequency response shall be 25 Hz to 16 kHz, +1, -3 dB and the signal-to-noise ratio shall be 60 dB. The receiver shall
have CE, FCC, RoHS, and WEEE approval. The receiver shall be covered by a ve-year parts and labor warranty, excluding earphones,
headphones, batteries and chargers.
The receiver shall be the Williams Sound model WIR RX22-4 or RX18.
*DISCLAIMER: FCC RULES LIMIT USE OF THIS EQUIPMENT TO AUDITORY ASSISTANCE
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!
Domestic Sales
Williams Sound
10300 Valley View Rd
Eden Prairie, MN 55344
Ph: 800-328-6190 / 952-943-2252
FAX: 952-943-2174
Email: info@williamssound.com
Web: www.williamssound.com
International Sales
International Sales Department
Williams Sound
10300 Valley View Rd
Eden Prairie, MN 55344 USA
Phone: +1 952 224 7791
Fax: +1 952 943 2174
Email: info@williamssound.com
Web: www.williamssound.com