Spectrum™ III Receiver Amplifier 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
| Receiver Input | Infrared FM |
|---|---|
| Modulation | FM wide-band |
| 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 |
| 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 panelALS: 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 V DC, USB |
| Power Supply | 19 V DC / 6.3 A; CE, CSA and UL listed |
| Dimensions | 7.5 × 8.5 × 1.75 in |
| Weight | 2 lbs 6.4 oz |
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
- ALS gain control
- ALS Output (3.5 mm)
- Five band digital equalizer ±12 dB
- 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)
- Two IR Mic Sensor Inputs (RCA)
- 5 Volt USB output for BRC-60
- Power Input: 19 VDC 3.4 A
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.
Ceiling Speaker
Drop-In Mic Charger
Handheld Microphone
Infrared Dome Sensor
Lay-In Ceiling Speaker
Sapphire™ Infrared Microphone
Wall Mount Cabinet
Wall Mount Speaker
