Overview
Clear-Com MS-704 4 CH. Headset Speaker Main Station
The MS-704 is a 2RU four-channel main station with programmable front panel buttons, individual channel short-circuit protection, individual channel volume control, and a regulated fail-safe power supply.
- Supports up to 55 beltpacks or 10 speaker stations on 4 channels
- Automatic short-circuit protection and reset with LED indicators
- Visual and audible call signaling
- 3 interruptible IFB channels
- Individual volume controls for each channel
- Program feed to both channels with selectable Program Interrupt
- Remote Mic Kill
- Stage Announce with relay
- Channel A & B Link switch
- Built-in speaker
- Universal voltage power supply
Specifications
Panel Microphone Input
Input Type: Electret
Input Impedance: >=2K
Mic Limiter Threshold: 0dBu ± 3dB
Mic Limiter Range: >= 20dB
Headset Microphone Input
Input Type: Dynamic
Input Impedance: >= 1K
Mic Limiter Threshold: 0dBu ± 3dB
Mic Limiter Range: >= 15 dB
Program Line Input
Maximum Level before Clipping: >= 20dBu
Input Impedance: >= 5K
Headset Output
Load Impedance: >= 8
Output Impedance: <= 25
Output Limiter Threshold: +5dBu ± 3dB
Maximum Output Level before Distortion: >= 17dBu
Speaker Output
Load Impedance: >= 4
Max Output Level before 1% Distortion: 20dBu ± 2dBu
Partyline Output
O Noise: < -74dBu
Output Impedance: >10K
Partyline Input
Crosstalk: < -60dB
Max level before Clipping: >= 12dBu
Sidetone Null Capability: > 25dB
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 ± 3dB
Headset Mic – Line Out: 200 – 12kHz ± 3dB
Program Input – Partyline: 100 17kHz ± 3dB
Program Input – Headset Out: 200 – 10kHz ± 3dB
Program Input – Speaker Out: 300 – 10kHz ± 3dB
Partyline – Headset Out: 200 – 10kHz ± 3dB
Partyline – Speaker Out: 300 – 10kHz ± 3dB
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: < -65dBu
Headset Mic – Partyline: < -70dBu
Headset Mic – Line Out: < -55dBu
Program Input – Partyline: < -85dBu
Program Input – Headset Out: < -60dBu
Program Input – Speaker Out: < -60dBu
Partyline – Headset Out: < -50dBu
Partyline – Speaker Out: < -50dBu
Max Gain
Panel Mic – Partyline: >= 37dB
Headset Mic – Partyline: 41dB ± 2dB
Headset Mic – Hot Mic Out: 55dB ± 3dB
Headset Mic – Announce Out: 55dB ± 3dB
Program Input – Partyline: >= -16dB
Program Input – Headset Out: >= 18dB
Program Input – Speaker Out: >= 24dB
Partyline – Headset Out: >= 34dB
Partyline – Speaker Out: >= 40dB
Min Gain
Panel Mic – Partyline: <= 25 dB
Mains Power
Input Voltage Range: 100 – 240V AC
Input Frequency Range: 50 – 60Hz
Input Power: <= 60V AC
Output Voltage: 30V DC ± 0.5V
Output Current per Channel (Continuous): 1.2A
Output Current per Channel (Peak): 2A (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
19 x 3.5 x 10.5in (WxHxD)
(483 x 88 x 267mm)
Weight
6.1lbs (2.8kg)
