LKP-957 Specifications
Speaker/Headset Amplifier
Audio Input Level (1kHz)
Input (from matrix): +8 dBu
Input Adjustment Range (for rated output): -2 to +14 dBu
Audio Output Level (1kHz)
Loudspeaker Output: 3 Watts, 8Ω
Headset Output: 500 mW, 8Ω
Frequency Response: 200 Hz to 7kHz, ±1 dB
Total Harmonic Distortion (THD): Less than 0.25% at full output, 200 Hz to 10kHz
Signal to Noise Ratio: 90 dB
Audio Volume Control Range: 30 dB
Common Mode Rejection: 60 dB, 120 Hz
Power Supply
Power Entry Module: CSA/UL/CE approved, with on/off switch and safety interlock fuse holder (prevents fuse removal
while power cord is plugged in).
AC Primary
115 VAC 10%, 50/60 Hz
230 VAC 10%, (Factory Option)
AC Power Rating: 30 Va
AC Fuse Rating
115 VAC: 6/10 Amp
230 VAC: ¼ Amp
Mechanical
Dimensions: 1¾” (44 mm) high, 19” (483 mm) wide, 7” (178 mm) deep
Weight: 9 lbs (4 kg)
Connector Pin Configurations
Headset Connector Type: DB-9
Serial Communication
Data: Single Pair, half duplex RS-422 Serial 9,600; 76,800 DPS
Ordering Information
LKP-957
Listen-Only Keypanel
Catalog Number: 90007470117
This specifications information is preliminary and is subject to change without notification.
Brand names mentioned are the property of their respective companies.
Contact Information
Telex Communications, Inc.
12000 Portland Avenue South
Burnsville, Minnesota 55337
Telephone: 877·863·4169
Fax: 800·955·6831
Form Number: LIT000039000
Date: April, 2006
