Forum™ 232 Receiver Amplifier

PN: IMA-232

Amplifier | Infrared Microphone Receiver | Audio Mixer

The Forum™ 232 is the perfect entry level Sound Field System for use in the classroom. The amplifier/receiver supports up to 2 infrared wireless microphones and multiple classroom audio sources all at once.

In addition to these must-have features, the Forum™ 232 includes a Digital Feedback Guard (DFG), computer anti-hum circuit, RS-232 input for a wall panel controller, lesson capture recording, and security alert compatibility.







Forum™ 232 Receiver Amplifier Details


  • Two infrared wireless microphone receivers
  • Two Power Amplifiers: 25 watts ea. channel, total 50 watts RMS class D amplifier
  • Security Alert Output
  • RS-232 wall panel control of line input levels
  • Switchable computer anti-hum circuit with ON/OFF switch
  • Three-band digital equalizer ±12 dB
  • Digital Limiting
  • Two auxiliary inputs RCA DVD with input gain, adjustable +10 dB boost Front-panel auxiliary input (3.5 mm)
  • Front Panel ALS Output for Assistive Listening system with gain control (3.5 mm)
  • Front Panel REC output for Lesson Capture with gain control. (3.5 mm)
  • Power sleep mode to conserve energy
  • Light Weight Aluminum cover
  • Teacher Priority instantly attenuates all line inputs
  • WC-400 Wall Mounted Cabinet (optional)
  • Rack or shelf/wall mounting kits (optional)


Receiver Input

Infrared FM


FM Wide-band

Reception Frequencies

Ch. A: 2.08 MHz, Ch. B: 2.54 MHz

Infrared Wavelength


Tone Signal

Ch. A: 32.768 kHz


50 μs

Frequency Response

40 Hz –18 kHz, ± 3 dB

S/N Ratio

›65 dB


‹1% @1 kHz

Nominal Deviation

±10 kHz

Maximum Deviation

±25 kHz

External Sensor Input

Two, RCA

Connectivity Coverage

1,600 Sq. Ft., 50 ft. line of sight

Aux Inputs

One DVD, Line Level, Dual RCA with +10 dB Gain Control
One Aux input with front and rear panel 3.5 mm

Line Output

Two 3.5 mm with Gain Control, Front Panel


Three-band digital ±12 dB

Output Power

Total (RMS), 25 watts ea. Two digital Amplifiers, 50 Watts

Output Impedance

4 Ω min.

Output Connection

One 4pin Phoenix Connector

Power Supply

19 VDC / 3.4 A CE,CSA and UL Listed

Dimensions 7.5 × 8.5 × 1.75 in
Weight 1 lbs 8.96 oz

Forum™ 232 Receiver Amplifier Components

Classroom Component Layout

  • Sapphire (IRT-60) wireless pendant transmitter, a high-quality cardiod microphone with lanyard.
  • ICS-55 Ceiling Sensor gives 360-degree infrared coverage for optimal audio performance.
  • Forum™ 232 Sound Field amplifier/receiver to support classroom audio sources.
  • SP-628 Ceiling Speakers (four shown) provide excellent quality voice reproduction.
  • SP-2000 Wall Mount Speakers (optional), allow for installation when ceiling is not accessible.

Forum™ 232 Receiver Amplifier Downloads