Forum™ Receiver Amplifier

Amplifier | Infrared Microphone Receiver | Audio Mixer






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Forum™ Receiver Amplifier Description

The TeachLogic Forum™ instructional audio system provides the classroom with a platform to clearly deliver all audio sources so that learning happens regardless of where the students are located.  This versatile system supports 2 infrared wireless microphones, 3 classroom audio sources like a computer or TV, and 2 audio outputs for assistive listening system connection, lesson capture recording, and/or video conferencing to support hybrid learning models.

In addition to these must-have features, the internal architecture of the Forum™ includes a Digital Feedback Guard (DFG) to suppress unwanted noise, a Computer Anti-Hum Circuit to eliminate those pesky low level humming sounds computers can make, and a USB charger for correct placement of and access to the microphone charger.

A 4th audio source can be added by using the IRT-66 Mobile Display Transmitter. Now you can easily roll in a portable audiovisual cart to any classroom and instantly connect to the Forum’s speakers. No additional wires needed.

Why IR?

Forum™ Receiver Amplifier Details


  • Amplifier: digital hybrid class D
  • Two Power Amplifiers: 25 watts ea. channel, total 50 watts RMS for 4 x 8Ω loudspeakers
  • 3 Line Level Inputs, mixed w/ the two microphone inputs
  • 2 Line Level Outputs
    • Rear panel mixed output for assistive listening system and/or lesson capture with gain control (3.5mm)
  • Hybrid Learning Compatible
    • Front panel input & output connects to host computer to synchronize classroom audio w/ video conference application
  • Digital Feedback Guard™
  • Switchable computer anti-hum circuit with ON/OFF switch
  • 3-band digital equalizer ± 10dB
  • Power sleep mode to conserve energy
  • Light weight aluminum cover
  • Teacher Priority function attenuates volume of all line inputs with button press
  • Drop-in microphone charger connection 5 VDC USB
  • Accommodates up to 3 ceiling sensors for increased microphone reception coverage and/or extra-large classrooms
  • WC-400 Wall Mounted Cabinet (optional)
  • Rack or shelf/wall mounting kits (optional)


Amplifier Output Power

50 W RMS, 2 x 25 W channels

Receiver Input

Infrared FM, 2 wireless mic channels


Wide-band FM

Reception Frequencies

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


10 kHz Nominal, 25 kHz Maximum


50 μs

Tone Key

32.768 kHz

Infrared Wavelength

850 nm

External Sensor Input

2, RCA, powered ports

Connectivity Coverage

1,600 sq ft per sensor, up to 3 sensors supported

Total Harmonic Distortion

<1% @1 kHz

Frequency Response

40 Hz – 18 kHz, ± 3 dB

Line Level Inputs

Rear Panel: DVD input, dual RCA, 0dB
Rear Panel: Computer input, 3.5mm, -10 dB
Front Panel: Auxiliary input, 3.5 mm, -10 dB

Anti-Hum Balun

Present on computer input

Line Outputs

Front Panel: 3.5 mm w/ gain control
Rear Panel: 3.5 mm w/ +10 dB gain control

Output Impedance

Rated Load: 4 Ω minimum impedance


3-band, ±10 dB

S/N Ratio

65 dB

Speaker Connection

4-pin Phoenix Connectors

Charger Output


Power Supply

19 VDC / 3.5 A CE, CSA and UL Listed

Dimensions 7.5 × 8.5 × 1.75 in
Weight 1 lbs 11.2 oz

Forum™ 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™ 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™ Receiver Amplifier Downloads

Forum™ Receiver Amplifier Frequently Asked Questions

  • add_circleremove_circle_outlineCan I use 1 system for 2 rooms, but turn off the speakers in the second room when they don't need to be used?

    Sometimes a single system is used to support two rooms. However, at times it may be desirable that the speakers in the second room are switched off so the sound does not play in that room. The best way to accomplish this would be with a 3rd party speaker switch such as the one seen here. It is wired inline between the TeachLogic amplifier and the speakers.

    1. Plan for the switch location, and measure the length of wire needed to ensure this device is within reach of the user.
    2. Connect the TeachLogic amplifier speaker channel that you wish to turn off to the “amp input” connection on this device.
    3. Then connect the speakers you wish to control to the “speaker output” connections on this device.
    4. Test.

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