TeachLogic Products > Classroom Audio Systems

Spectrum™ III Amplified Classroom Audio System

Name: Spectrum™ III Amplified Classroom Audio System
SKU: IMA-820:
Availability: InStock

PN: IMA-820

Amplifier | Infrared Microphone Receiver | Audio Mixer

4 AUDIO INPUTS

2 MICS

RS-232

SECURITY ALERT

FIRE ALARM

PAGE MUTE

Category: Classroom Audio Systems

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

Power on/off
CH A Microphone Volume Control
CH B Microphone Volume Control
DVD Volume Control
Computer Volume Control

Aux Volume Control
MP3 Volume Control
MP3 Input (3.5 mm)
Lesson Capture Volume Control
Lesson Capture Output (3.5 mm)

REAR PANEL

Back of IMA-820 receiver/amplifier

Speaker Output - Four Channel Four pin Phoenix connector
Fire Alarm Input- contact closure
Page Pass Through 2 pin Phoenix
Page Sensitivity control
Page impedance selector
Five band digital equalizer ±12 dB
Two IR Mic Sensor Inputs (RCA)
5 Volt USB output for BRC-60
Power Input: 19 VDC 3.4 A

ALS gain control
ALS Output (3.5 mm)
RS-232 (Tx, Gnd, Rx) 3-pin
Security Alert - contact closure
Aux-Mic Input Selector
Aux-Mic Input (3.5 mm)
Computer Input (3.5 mm)
Computer Anti hum ON/OFF
DVD dual Mono Inputs (RCA)

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

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Spectrum™ III Amplified Classroom Audio System Description