Rated Output Level: (Ref. 1 kHz)
Main Output: (balanced, LINE position) + 10 dBm (balanced, MIC position) -40 dBm
Preamp Output: (unbalanced) 0 dBm
Link Output: (unbalanced)
100 mVrms (-18 dBu), 10 kfl load

Signal-to-Noise Ratio:
Main Output: >85 dB (rated output, A-weighted, EQ defeated, compressor/limiter off)
Preamp Output: >75 dB (rated output, A-weighted, EQ defeated, compressor/limiter off)
Link Output: >75 dB (rated output, A-weighted)

Minimum Load Impedance: Main Output:
Line Level balanced: 600 11 minimum
Mic Level balanced: 600 Sl minimum
Preamp Output:
unbalanced: 600 fl minimum Link Output:
unbalanced: 2 kSZ minimum

Equalization: (Shelving type)
Bass: ± 12 dB at 100 Hz
Treble: ± 12 dB at 10 kHz

Compressor/Limiter: Feedforward Topology
Threshold: -20 dB to +20 dB Continuously variable
(Ref. 100 mVrms on Link input)
Compression Ratio: l:l to 00:l Continuously variable
Release Time: 50 msec to 5 sec. Continuously variable

Tone Generator: Electronically produced
Tones: Buzzer, siren, single-tone chime, and repeating tone chime
Control: All tones are initiated by external switch closures
Level Adjustment: Rear panel

Front Panel Controls:
Input: 6 - Input Level adjust
EQ Controls: 1- Bass adjust
1 - Treble adjust
1 - EQ In/Defeat switch
Output: 1- Master Level adjust
Compressor/Limiter: 1- Release Time adjust (screwdriver slotted) 1 - Threshold adjust (screwdriver slotted) 1 - Compression Ratio adjust (screwdriver slotted) 1 - On/Off switch
Miscellaneous: 1- AC Power switch

Rear Panel Controls:
Tone Generator: 1- Output Level adjust (screwdriver slotted)
Output: I -.Output level select switch (MIC or LINE)

Indicators:
Front Panel: 6 - Green LED's (Nominal Input level)
6 - Red LED's (Peak Input level) 1- Red LED (Main Output clip) I - AC Power ON

Connectors:
Inputs:
Link Input: 1- RCA phono receptacle
Battery: 1 - 3-terminal barrier strip
Outputs:
Main Output: 1- Male XLR connector
1 - 3-terminal barrier strip
Preamp Output: 1- RCA phono receptacle
Control:
Mute and Tone Generator: Screw terminals (7)

Power Requirements: (Ref. I kHz, rated output with no modules installed)
AC Mains: 100, 120, 200, 220 or 240 VAC, 50/60 Hz
Battery: ±48 VDC bipolar, 0.5 amps maximum

Power Consumption
and Heat Produced: 17 watts consumed, 57.5 BTU/hour

Operating
Temperature Range: Up to 50°C (122°F)

Dimensions:
Width: 19 inches (48.3 cm)
Height: 5'/, inches (13.3 cm)
(3 standard rack units) Depth: 13 inches (33.0 cm)

Net Weight: 15 lbs. (6.8 kg)

Finish Color: Black

Accessories Included
with Mainframe:
1- Operating/Service Instructions for Mainframe,
1780A/AT, 1781A/AT and 1783
4 - Rubber Feet (installed)
1- System Configuration Label installed on top cover 1- International 220/240 VAC voltage decal 1 - International Fuse decal 1- Fuse for International use 1- Rack mount hardware kit
Altec Lansing continually strives to improve their products and performance. Therefore, specifications are subject to change without notice.