TeachLogic Spectrum III tilt
TeachLogic Spectrum III tilt
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TeachLogic Sapphire Wireless Microphone tilt
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TeachLogic Products > Classroom Audio Systems

Spectrum™ III Amplified Classroom Audio System

PN: IMA-820
Amplifier | Infrared Microphone Receiver | Audio Mixer

4 AUDIO INPUTS

2 MICS

RS-232

SECURITY ALERT

FIRE ALARM

PAGE MUTE

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Spectrum™ III Amplified Classroom Audio System Description

The Spectrum™ III is our most powerful Sound Field System for use in the classroom.

It supports not only the features that every classroom needs to control multimedia audio, but also the integrations to ensure that all school communications are heard: pages, fire alarm, and security alert.

When paired with wireless microphones and overhead speakers, the Spectrum™ III ensures that crystal clear sound is delivered to every seat in the room.

Spectrum™ III Amplified Classroom Audio System Details

Features

  • 2 infrared wireless microphone receivers
  • Power amplifiers: 4 @ 25 W RMS (100 watts total), digital hybrid class D
  • Security Alert contact closure connection
  • Fire Alarm contact closure input
  • Page override (muting) with pass-through to classroom speakers; input level:
  • 100 V, 70 V, 25 V
  • 4 line inputs: DVD, computer, MP3 & aux
  • Rear panel: 3.5 mm auxiliary input (mic or line level switch)
  • Rear panel: 3.5 mm computer input w/ anti-hum (On/Off switch)
  • Front panel: 3.5 mm auxiliary (MP3) input
  • Rear panel: DVD input, dual RCA
  • Lesson Capture output with level control on rear panel (3.5 mm)
  • ALS output with level control on rear panel (3.5 mm) 5-band equalizer
  • Digital Feedback Guard (DFG) Remote teacher priority over line inputs (enabled by Sapphire microphone)
  • Power sleep mode to conserve energy
  • Drop-in charger connection 5 VDC USB
  • Power up to 8, 8 Ω speakers
  • 2 external microphone sensor inputs, single RCA
  • Rack or shelf/wall mounting kits (optional)
  • WC-400 Wall Mount Cabinet (optional)

Specifications

Weight 2.375 lbs
Dimensions 7.5 × 8.5 × 1.75 in
Receiver Input

Infrared FM, 2 wireless mic channels
Modulation

Wide-band FM
Reception Frequencies

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

850 nm
Tone Signal

Ch. A: 32.768 kHz
De-emphasis

50 μs
Frequency Response

40 Hz – 18 kHz, ±3 dB
S/N Ratio

>65 dB
Total Harmonic Distortion

<1% @ 1 kHz
Nominal Deviation

±10 kHz
Maximum Deviation

±25 kHz
External Sensor Input

2, RCA
Connectivity Coverage

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

1 dual RCA, 3 x 3.5 mm aux line level (1 anti-hum)
Line Output

Lesson Capture: 3.5 mm with gain control – front panel
ALS: 3.5 mm with gain control – rear panel
Page Input

2-pin Phoenix; 3 settings: 100 V, 70 V, 25 V
Sensitivity

Level control
Security Alert

Contact closure (COM, N/O, N/C)
Fire Alarm

Contact closure (mutes audio)
Equalization

5-band, ±12 dB
Output Power

4 amplifiers @ 25 W (RMS), 100 W total
Output Impedance

4 Ω
Speaker Connection

4-pin Phoenix connectors
Charger Output

5 VDC, USB
Power Supply

19 VDC / 6.3 A; CE, CSA and UL listed

FRONT PANEL

Front of IMA-820 receiver/amplifier
  1. Power on/off
  2. CH A Microphone Volume Control
  3. CH B Microphone Volume Control
  4. DVD Volume Control
  5. Computer Volume Control
  1. Aux Volume Control
  2. MP3 Volume Control
  3. MP3 Input (3.5 mm)
  4. Lesson Capture Volume Control
  5. Lesson Capture Output (3.5 mm)
Spectrum III Front Panel

REAR PANEL

Maxim III IMA 520 Rear Panel Details
Back of IMA-820 receiver/amplifier
  1. Speaker Output - Four Channel Four pin Phoenix connector
  2. Fire Alarm Input- contact closure
  3. Page Mute Input - 2 pin Phoenix
  4. Page Sensitivity control
  5. Page impedance selector
  6. ALS gain control
  7. ALS Output (3.5 mm)
  8. Five band digital equalizer ±12 dB
  1. RS-232 (Tx, Gnd, Rx) 3-pin
  2. Security Alert - contact closure
  3. Aux-Mic Input Selector
  4. Aux-Mic Input (3.5 mm)
  5. Computer Input (3.5 mm)
  6. Computer Anti-hum ON/OFF
  7. DVD dual Mono Inputs (RCA)
  8. Two IR Mic Sensor Inputs (RCA)
  9. 5 Volt USB output for BRC-60
  10. Power Input: 19 VDC 3.4 A

Spectrum™ III Amplified Classroom Audio System 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.
  • Spectrum™ III 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.

Spectrum™ III Amplified Classroom Audio System Downloads

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