Williams Sound WIR SYS 4 User Manual



©2006, Williams Sound Corp.  MCAT 030D

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NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!
*90 days on accessories

The Language Interpretation System, model WIR SYS 4, is the ideal package for courtrooms that may be required
to translate up to four languages simultaneously. Participants wear the RX22-4 body-pack style receiver to listen to
the language of their choice. They can sit anywhere in a 11,000 ft

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area and can adjust the volume to meet their

comfort level. For the hard of hearing participant, the RX22-4 receiver can be used with a neckloop (included) to
amplify the participant’s telecoil equipped hearing aid. SoundPlus infrared technology ensures privacy and securi-
ty: the message of the proceeding will not travel outside the walls of the courtroom.  

Each WIR SYS 4 package includes: two (2) TX9 emitters, two (2) MOD 232 modulators, four (4) RX22-4 receivers,
four (4) HED 021 headphones, one (1) NKL 001 neckloop, and one (1) RPK 005 rack panel kit. The WIR SYS 4 meets
and exceeds government ADA regulations for public hearing assistance, and is backed by a five-year warranty.*

Size, Weight:

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)

Color:

Black epoxy paint with white legends

Rack Mount:

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

Power Supply:

Wall Transformer, 24VAC, 50-60 Hz, 15VA
North America:

TFP 016, UL/CSA

Europe:

TFP 027-01, 2-pin Schuko plug, CE

UK:

TFP 027-02, 3-pin UK plug, CE

Modulation:

FM Wideband, +50kHz deviation, 50uS pre-emphasis

Carrier Frequency:

Channel A: Selectable, 2.3/2.8/3.3/3.8 MHz,
Channel B: Selectable, 2.3/2.8/3.3/3.8 MHz

Signal-to-Noise Ratio:

More than 60dB

Frequency Response:

30 to 16,000 Hz, +1 dB, -3 dB, electrical response

Total Harmonic Distortion:

Less than 2%, electrical response

Audio Processing:

Compression (slope) adjustable from 1:1 to 4:1  
Switchable compression gain: Moderate: 16 dB. Max: 33 dB

Auto Carrier Shut-Off:

15-minute timer shuts off carrier when no audio is present (can be disabled)

Two Channel Infrared System Modulator

Williams Sound

Microprocessor Controlled

 Frequency Synthesized

Power Switch:

Two-position push button, ON/OFF

Power Indicator:

Green LED

Audio Level Controls:

CHA and CHB Input Level, rotary knobs

Audio Indicators:

CHA and CHB Audio Level, 10-segment LED’s

Carrier LEDs:

4 green LED carrier “on” indicators per channel (indicates frequency, malfunctions)

Compress Control:

1:1 to 4:1

Input Mix LED:

Indicates inputs A and B audio are mixed and transmitted by CHA, CHB off

Stereo LED:

Indicates stereo mode

Phones Switch:

Selects CH1 or CH2 for phones when not in stereo mode

Phones Output:

1/4" TRS headphone jack. Accepts stereo, mono, and any impedance phones.

Infrared Test LED:

IR LED for receiver testing, monitoring, and audio signal testing.