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Clear-Com MS-440 Communication Master Station 4-Channel

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Clear-Com MS-440 Communication Master Station 4-Channel

The MS-440 Intercom station is a 4-channel microprocessor controlled station intended to work with other Clear-Com Party-Line products. This station has a speaker, provisions for installing a panel microphone, and a headset connector. The MS-440 is a 4 channel Main station that contains a 2 amp. no fail system power supply.


  • MICROPROCESSOR CONTROL: Most aspects of station operation are under microprocessor control.
  • REMOVABLE ACCESS PANEL: A removable access panel allows access to most controls and option dip switches.
  • REMOVABLE RACK MOUNTING BRACKETS: Removable rack mounting brackets allows the units to be rack mounted or used 'stand-alone' as a table top unit.
  • INDIVIDUAL CHANNEL CONTROLS: Each channel has individual Talk, Listen, and Call push-buttons for each channel.
  • MOMENTARY/LATCHING TALK BUTTONS: The TALK buttons have a momentary and latching action depending on how the button is used. The latching function can be defeated with dip switches.
  • INDIVIDUAL CHANNEL ADJUSTMENTS: Each channel has individual listen level controls, channel null adjustments, and program feed level controls.
  • MULTIPLE PROGRAM INPUTS: Multiple program inputs are provided for local station monitoring and program feed to intercom lines for local talent cueing (IFB).
  • INTERNAL IFB (IFB - Interrupt Foldback of program feeds): Program can be fed to each channel and interrupted (IFB) when a Talk function is active or when a Call signal is received on that channel. An internal jumper determines whether the IFB function is Talk or Call signal activated.
  • LINK FUNCTION (MS-440): The MS-440 has a LINK function that places all channels into a common party-line at the single push of a button.
  • ALL-TALK: An ALL-TALK button allows instant access to all channels.
  • ANNOUNCE FUNCTION: An ANNOUNCE button allows external paging. A set of relay contacts is provided to control an external system.
  • PROGRAM FEED OVER STAGE ANNOUNCE: An internal jumper allows the main program feed to be fed to the Stage Announce output. The program is automatically interrupted when the ANNOUNCE button is pressed.
  • MIC ON/OFF SWITCH: A separate MIC ON/OFF push-button allows turning the microphone off without upsetting the setting of TALK switches.
  • EXTERNAL MIC ON/OFF INPUT: An external logic input allows the MIC ON/OFF function to be switched remotely.
  • EXTERNAL IFB and HOT MIC OUTPUT: A rear panel jack provides direct connection to Clear-Com's external IFB system such that the station's microphone can be used in the external IFB system.
  • A buffered unswitched output of the selected microphone is also available.
  • SPEAKER ON/OFF SWITCH: The speaker may be turned on and off with a front panel switch.
  • SPEAKER MUTING: Whenever a TALK is active the Speaker output is muted approximately 6 dB to prevent feedback.
  • PANEL MIC GAIN: The preamplifier for the Panel microphone has a gain trim adjustment to allow field trimming. Adjustment of the panel microphone gain also varies the frequency response of the preamplifier to compensate for feedback when the microphone is used up close.
  • 2 AMP. POWER SUPPLY WITH SHORT CIRCUIT PROTECTION: The SB-440 features redundant powering to remote stations by providing separate short circuit protected power sources to each of the four intercom lines.
  • A short on one intercom line will not bring the whole system down. Short circuit indicators are provided on the front panel for each channel.


  • CONTROL SYSTEM: Microprocessor controlled logic and CMOS electronic switches.
    • Dynamic Headset Input Impedance: - 200 Ohms
    • Input Level: - 55 dBv* nominal
    • Frequency Response: 150 Hz to 15 KHz, contoured for intelligibility.
    • Gain from Headset to Intercom Line: +41 dB
    • Input Level: 45 dBv* nominal
    • Frequency Response: 150 Hz to 15 KHz, contoured for intelligibility.
    • Gain from Panel Mic to Intercom Line: +31 dB (adjustable)
    • Load Impedance: 8 - 50 Ohms
    • Output Level: 4 watts into 8 Ohms
    • Distortion: <0.5% THD at 1 KHz
    • Frequency Response: 200-15KHz + /-2dB
    • Load Impedance: 50 - 2000 Ohms
    • Output Level: at least +20 dBv* across 600 Ohms
    • Distortion: <0.2% THD at 1 KHz
    • Frequency Response: 150-18KHz +/-2dB
    • Gain from Intercom Line: +37 dB
    • Input Level Ref.: 0 dBv*
    • Input Impedance: >10 KOhms
    • Frequency Response: 150 Hz to 15 KHz
    • Impedance, Bridging: >10 KOhms
    • Level, Line (200 ohm load): -14 dBv* (nominal) +5dBv (max before clip)
    • Sidetone Null Capability: >25 dB (200Hz - 10 KHz)
    • Crosstalk, Station Induced Ch. to Ch.: >60 dB
    • Noise, S/N Ratio in Listen Channels: >60 dB
    • SA (Announce)
      • Type: Balanced
      • Impedance: 600 ohms
      • Level: 0 dBv
    • IFB/Hot Mic:
      • Type: Unbalanced
      • Impedance: 600 Ohms
      • Level: 0 dBv
    • Usable Line Quality: > 100 Stations
    • Total Line Length on One Channel: > 5000 feet
    • Intercom: (MS-440): 8 XLR-3M
    • Intercom: (RM-440): 4 XLR-3M and 4 XLR-3F
    • Announce Output: XLR-3M
    • Program Input (Main): XLR-3F
    • Accessory: DB-15F
      • Auxiliary Program Inputs (4)
      • Foot Switch Logic Input
      • Line Level Output (Sig n al being sent to speaker amp.)
      • Announce Relay Output
    • IFB/HotMic: 1/4inch Phone Jack
    • MS-440 Source: AC Power Line
      • Voltage: 90 - 240 V AC 50-60 Hz
      • Power In: 80 VA Max.
      • 30 VDC Intercom Power Out: 2.0 Amp Continuous short circuit protected, 1 3/4 Amp. each channel
    • RM-440 Source: Intercom Line
      • Voltage: 20 - 30 VDC
      • Current: 90 mA idle, 150 mA average
    • Dimensions: 19"W x 3.5"H x 10.S"D (483mm x 88mm x 267mm)
    • Weight (MS-440): 7.4 lbs. (3.4 Kg)
    • Weight (RM-440): 5.9 lbs. (2.7 Kg)
    • Operating Temperature Range: 32-122° F (0-50° C)


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