Clear-Com MS-704, 4 Ch. headset/speaker main station

Panel Microphone Input
Input Type: Electret

Input Impedance: >=2K

Mic Limiter Threshold: 0 dBu ±3 dB

Mic Limiter Range: >= 20 dB

Headset Microphone Input
Input Type: Dynamic

Input Impedance: >= 1K

Mic Limiter Threshold: 0 dBu ± 3dB

Mic Limiter Range: >= 15 dB

Program Line Input
Maximum Level before Clipping: >= 20 dBu

Input Impedance: >= 5K

Headset Output
Load Impedance: >= 8

Output Impedance: <= 25

Output Limiter Threshold: +5 dBu ± 3 dB

Maximum Output Level before Distortion: >= 17 dBu

Speaker Output
Load Impedance: >= 4

Max Output Level before 1% Distortion: 20 dBu ± 2 dBu

Partyline Output
O Noise: < -74 dBu

Output Impedance: >10 K

Partyline Input
Crosstalk: < -60 dB

Max level before Clipping: >= 12 dBu

Sidetone Null Capability: > 25 dB

Stage Announce/Balanced Line Out
Type: Balanced

Output Impedance: >= 200

Load Impedance: >= 600

IFB/Hot Mic
Type: Unbalanced

Output Impedance: 180

Load Impedance: >= 600

Frequency Response
Panel Mic – Partyline: 600 – 10KHz ± 3dB

Headset Mic – Partyline: 200 – 12KHz ± 3 dB

Headset Mic – Line Out: 200 – 12KHz ± 3 dB

Program Input – Partyline: 100 17KHz ± 3 dB

Program Input – Headset Out: 200 – 10KHz ± 3 dB

Program Input – Speaker Out: 300 – 10KHz ± 3 dB

Partyline – Headset Out: 200 – 10KHz ± 3 dB

Partyline – Speaker Out: 300 – 10KHz ± 3 dB

Max Distortion
Panel Mic – Partyline: <= 0.5%

Headset Mic – Partyline: <= 0.5%

Headset Mic – Line Out: <= 0.5%

Program Input – Partyline: <= 0.2%

Program Input – Headset Out: <= 0.2%

Program Input – Speaker Out: <= 0.5%

Partyline – Headset Out: <= 0.2%

Partyline – Speaker Out: <= 0.5%

Noise
Panel Mic – Partyline: < -65 dBu

Headset Mic – Partyline: < -70 dBu

Headset Mic – Line Out: < -55 dBu

Program Input – Partyline: < -85 dBu

Program Input – Headset Out: < -60 dBu

Program Input – Speaker Out: < -60 dBu

Partyline – Headset Out: < -50 dBu

Partyline – Speaker Out: < -50 dBu

Max Gain
Panel Mic – Partyline: >= 37 dB

Headset Mic – Partyline: 41 dB ± 2 dB

Headset Mic – Hot Mic Out: 55 dB ± 3 dB

Headset Mic – Announce Out: 55 dB ± 3 dB

Program Input – Partyline: >= -16 dB

Program Input – Headset Out: >= 18 dB

Program Input – Speaker Out: >= 24 dB

Partyline – Headset Out: >= 34 dB

Partyline – Speaker Out: >= 40 dB

Min Gain
Panel Mic – Partyline: <= 25 dB

Mains Power
Input Voltage Range: 100 – 240 VAC

Input Frequency Range: 50 – 60 Hz

Input Power: <= 60 VAC

Output Voltage :30 VDC ± 0.5V

Output Current per Channel (Continuous): 1.2 A

Output Current per Channel (Peak): 2 A (Do not exceed the 1.2A rating for more than 2 seconds per 1 minute period)

Short Circuit Recovery Time (1st short):<= 0.5 sec

Short Circuit Recovery Time >= 20 shorts in 20sec: <= 20 sec

Environmental
32 – 122°F (0 – 50°C)

Dimensions
1.75 x 19 x 6.5 in (HxWxD)

(44 x 483 x 165 mm)

Weight
6.1 lbs (2.8 kg)