Clear-Com MS-704 4-Channel Main Station

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The 704 series is Clear-Com's most advanced party-line intercom system. Each station is a four-channel intercom with superior audio and versatile channel access to provide unmatched communication flexibility. All front-panel controls are intuitive and easy to operate. The station's front-panel buttons are programmable and can be customized for a wide variety of applications that will meet the demands of any stage, studio, or field producer. Separate volume controls for every channel ensure the perfect audio mix in the headset or on the integral speaker. The regulated power supply in the MS-704 provides power for the entire intercom system.

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 plut-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 off 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 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.

Features:

• Four independent intercom channels for ultimate flexibility
• Microprocessor-Controlled Logic assures maximum communications power
• Universal voltage power supply for 100 - 240 VAC operation, with shortcircuit protection on each channel
• Linking control instantly links channels together in “super party line”
• Separate Talk and Listen buttons for each channel
• Individual Listen volume controls for each channel
• “All-Talk” function permits instant communications to all four channels
• Four separate program inputs are electronically balanced
• Three interruptible IFB channels make talent cueing easy
• “Announce” button with relay for external paging
• Visual “Call Signaling” alerts users when others want to speak to them
• Wide-range high-output speaker for optimum clarity in all acoustic environments
• “Hot-Mic” output allows easy connection to external IFBs
• Adjustable mic proximity compensation reduces acoustic feedback
• Superior “Contoured” Audio insures excellent voice intelligibility under all noise conditions, including high-noise environments
• LED buttons for talk, call, announce, link, all talk, and mic on
• Remote Mic Kill switch turns off the microphone talk circuits

• Panel Microphone Input:
  • Input Type: Electret
  • Input Impedance: >=2KΩ
  • Mic Limiter Threshold: 0 dBu ±3 dB
  • Mic Limiter Range: >= 20 dB
• Headset Microphone Input:
  • Input Type: Dynamic
  • Input Impedance: >= 1KΩ
  • Mic Limiter Threshold: 0 dBu ± 3dB
  • Mic Limiter Range: >= 17 dB
• Program Line Input:
  • Maximum Level before Clipping: >= 20 dBu
  • Input Impedance: >= 5KΩ
• Headset Output:
  • Load Impedance: >= 8Ω
  • Output Impedance: <= 25Ω
  • Output Limiter Threshold: +5 dBu ± 3 dB
  • Maximum Output Level Before Distortion: >= 17 dBu
• Speaker Output:
  • Load Impedance: >= 4Ω
  • Max Output Level Before 1% Distortion: 20 dBu ± 2 dBu
• Partyline Output:
  • Off Noise: < -74 dBu
  • Output Impedance: >10 KΩ
• 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: >= 200Ω
  • Load Impedance: >= 600Ω
• IFB/Hot Mic:
  • Type : Unbalanced
  • Output Impedance: 150Ω
  • Load Impedance: >= 600Ω
• 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 20 sec: <= 20 sec
• Station Capacity: Up to 40 RS-601 beltpacks or 10 speaker stations or 12 headset stations distributed over both channels
• Rear Panel Connectors:
  • Intercom: XLR-3M (2 per channel)
  • Announce Out: XLR-3M (audio)
  • Program: (1) XLR-3
  • Hot Mic / IFB Interface: (1) 1/4 in. (0.64 cm) phone jack
  • Accessory: (1) DB-15F
  • AC Power: IEC 320 connector
• Rear Panel Controls: (1) Power switch
• Front Panel Connectors:
  • Panel Mic: (1) 1/4 in. (0.64 cm) panel mounting jack
  • Headset: (1) XLR-4M
• Front Panel Controls & Indicators:
  • (1) Panel / headset mic switch
  • (1) Mic on button
  • (1) All talk button
  • (1) Announce button
  • (1) Partyline link button
  • (4) Program ON-OFF-INTERRUPT DIP switches
  • (1) Program level control
  • (4) Listen adjust controls
  • (4) Channel null adjust controls
  • (4) Channel program feed adjust controls
  • (4) Talk buttons
  • (4) Call buttons
  • (4) Listen buttons
  • (1) RMK button
  • (1) Speaker ON-OFF switch
  • (1) Speaker volume control
  • (4) Short LEDs
  • (1) Speaker ON-OFF switch
  • (1) Speaker ON-OFF switch
  • (1) Panel mic gain control
  • (1) Sidetone adjust control
  • (1) Headset audio limiter DIP switch
  • (3) Interrupt enable DIP switches
  • (4) Auto-call DIP switches
  • (4) Auto-talk/listen DIP switches
  • (4) Talk latch disable DIP switches
  • (4) Line length DIP switches
• Operating Range: 32° to 122° F | 0° to 50° C)
• Dimensions (W x H x D): 19 x 3.5 x 10.5 in | 483 x 88 x 267 mm
• Weight: 10.86 lbs | 4.94 kg