Clear-Com HB-704 - Manual (Page 19)

H B - 7 0 2 / H B - 7 0 4 T W O - A N D F O U R - C H A N N E L 4 - 1
TECHNICAL
SPECIFICATIONS
HB-702/HB-704 TWO- AND FOUR CHANNEL
HEADSET STATIONS
dBu is an absolute measurement. 0 dBu is referenced to 0.775 volts RMS
Headset Microphone Input
Input Type Dynamic
Input Impedance >= 1K Ω
Mic Limiter Threshold -2dBu ± 3dB
Mic Limiter Range >= 15dB
Program Line Input
Input Impedance >= 5K Ω
Headset Output
Load Impedance >= 8 Ω
Output Impedance <= 25 Ω
Output Limiter Threshold +5dBu ± 3dB
Maximum Output Level before Distortion >= 17dBu
Party Line Output
Off Noise < -74dBu
Output Impedance >10K Ω
Party Line Input
Crosstalk < -60dB
Max level before Clipping >= 12dBu
Frequency Response
Headset Mic - Party Line 300 - 15KHz ± 3dB
Party Line - Headset Out 300 - 15KHz ± 3dB
Max Distortion
Headset Mic - Party Line <= 0.5%
Party Line - Headset Out <= 0.2%
Noise
Headset Mic - Party Line < -70dBu