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Review Summary
Input Type: Electret
Input Impedance: >=2kOhms
Mic Limiter Threshold: 0dBu +/-3dB
Mic Limiter Range: >= 20dB
Input Type: Dynamic
Input Impedance: >= 1kOhms
Mic Limiter Threshold: 0dBu +/-3dB
Mic Limiter Range: >= 17dB
Maximum Level before Clipping: >= 20dBu
Input Impedance: >= 5kOhms
Load Impedance: >= 8Ohms
Output Impedance: <= 25Ohms
Output Limiter Threshold: +5dBu +/-3dB
Maximum Output Level before Distortion: >= 17dBu
Load Impedance: >= 4Ohms
Max Output Level before 1% Distortion: 20dBu +/- 2dBu
Off Noise: < -74dBu
Output Impedance: >10kOhms
Crosstalk: < -60dB
Max level before Clipping: >= 12dBu
Sidetone Null Capability: > 25dB
Type: Balanced
Output Impedance: >= 200Ohms
Load Impedance: >= 600Ohms
Type: Unbalanced
Output Impedance: 150Ohms
Load Impedance: >= 600Ohms
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
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%
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
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
Panel Mic - Partyline: <= 25dB
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
Up to 40 RS-601 beltpacks or 10 speaker stations or 12 headset stations distributed over all channels
Intercom: XLR-3M (2 per channel)
Announce Out: XLR-3M (audio)
Program: 1x XLR-3F
Hot Mic / IFB Interface: 1x 1/4 in. (0.64 cm) phone jack
Accessory: 1x DB-15F
AC Power: IEC 320 connector
1x Power switch
Panel Mic: 1x 1/4 in. (0.64 cm) panel mounting jack
Headset: 1x XLR-4M
1x Panel / headset mic switch
1x Mic on button
1x All talk button
1x Announce button
1x Partyline link button
4x Program ON-OFF-INTERRUPT DIP switches
1x Program level control
4x Listen adjust controls
4x Channel null adjust controls
4x Channel program feed adjust controls
4x Talk buttons
4x Call buttons
4x Listen buttons
1x RMK button
1x Speaker ON-OFF switch
1x Speaker volume control
4x Short LEDs
1x Panel mic gain control
1x Sidetone adjust control
1x Headset audio limiter DIP switch
3x Interrupt enable DIP switches
4x Auto-call DIP switches
4x Auto-talk/listen DIP switches
4x Talk latch disable DIP switches
4x Line length DIP switches
32 to 122 deg. F (0 to 50 deg. C)
19 x 3.5 x 10.5" (482.60 x 88.90 x 266.70mm)
10.86lbs (4.93kg)
Superior "Contoured" Audio
Compatible with all Clear-Com party-line intercoms, the 704 series accepts a wide range of dynamic headsets, with a choice of headset connectors. Optional plug-in noise-cancelling gooseneck microphones are available in 9" and 18" lengths.
Remote Mic Kill (RMK)
The MS-704 is equipped with a global RMK button. It will turn o the microphone talk circuits of all Clear-Com beltpacks in the system, eliminating extraneous noise from the "open" headset microphones.
Redundant "Failsafe" Power Supply
The 1.2-amp universal switching power supply is a 30-volt regulated supply with multiple short-circuit protection. It can sense the difference between a long-term short circuit and an instantaneous overload, allowing the intercom to continue to operate even when a station is plugged in, momentarily exceeding the capacity of the power supply. If a shutdown occurs from a shorted intercom cable, the power supply will recover under full load when the short is removed.
"Easy Access" Sub Panel
A removable front panel gives the operator easy access to the station's configuration switches and trim pots. Clearly labeled and simple to adjust, these controls allow the station to be instantly configured for virtually any communications application. When configuration is complete, the front panel re-attaches, revealing only those controls useful for normal operation.
Multiple Program Audio Sources
The station accepts five separate program audio sources: four line-level balanced inputs and one assignable line level input. The assignable program input accepts a balanced signal and is designed for monitoring external audio in the headset or speaker. The four balanced program inputs can be used to create individual program feeds on the intercom channels. Three of these channels can be used for program interrupt.