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Telex Audiocom EMS-4001 4-Channel Expansion Station
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    Telex Audiocom EMS-4001 4-Channel Expansion Station

    Item #: TX-EMS4001   •   MFG #: EMS-4001




    This Master Station Expansion Panel is a 4-channel expansion unit with 2.0 amp power supply that connects seamlessly to the TX-MS2002 Master Station

    The EMS-4001 adds four (4) powered intercom channels to an MS-2002 or 2001 Master Station, and it provides talk, listen and call
    buttons for the added channels. Up to four (4) EMS-4001 Expansion Master Stations may be connected to the MS-2002 or 2001
    allowing up to 16 channels (18 channels total). The MS-20012 microphone is used to talk back to the EMS-4001 channels, and the MS-2002 speaker is typically used for listening. However, there are also separate speaker jacks on the back panel of the EMS-4001 for independent monitor speakers, if desired. There are also four (4) additional program inputs on the back of the EMS-4001, one (1) for each added channel.

    The MS-2002/ EMS-4001 combination can be used as a simple, multi-channel intercom user stations. In this configuration, the program inputs (and possibly the PA output of the MS-2001) are most likely not used, and the station operator has only talk, listen and call capability. It is also possible the advanced features of the MS-2001, such as Mic Kill Send, might be turned off.

    Alternatively, the MS2002/ EMS-4001 can be used as a master station. In this application, one (1) or more program inputs and the PA output may be connected, and the program signals to the intercom channels can be turned on or off from the MS-2001. Additionally, the Mic Kill Send feature can be enabled, and microphones on any channels may then be turned off from the MS-2001.

    • Features

      • Simplified Expansion
      • The EMS-4001 integrates four powered channels with talk, listen, and call controls in a single rack mount unit. Saves on rack mount hardware and eliminates power supply to expansion station interconnect cables.
        Compatibility and Flexibility
      • Connects directly to an MS-2002, MS-4002 or US-2002 Master Station to add 4 complete powered channels. Or connects to a previous EMS-4001 or ES-4000A Expansion Station to add another 4 powered channels (up to 18-20 channels total).
        Overload/Short-Circuit Protection
      • Provides automatic current limiting during short circuits or overloads. Front panel fault indicator provided for each channel. The SPS-2001 has Instantaneous Auto Reset (IAR), the newest technology in performance and safety, which uses a revolutionary new circuitry that dynamically monitors line fault conditions.
        Mic Kill
      • Turn off all microphones on a selected expansion channel, or all channels, using the master station’s Mic Kill key.
        Dedicated Program Inputs
      • Each expansion channel has its own program input. Connect any line-level audio source for monitoring in the master station’s speaker or headset and for routing to the expansion channel if desired. When program audio is routed to the channel it can be set to interrupt while the master station operator is talking on the channel.
        Binaural (Stereo) Listening
      • If the master station is equipped with external powered speakers you can assign the EMS-4001 channels to either right or left speaker.
        Instantaneous Auto-Reset
      • Instantaneous Auto Reset (IAR), the newest technology in performance and safety, which uses a revolutionary new circuitry that dynamically monitors line fault conditions. Then, when the fault is removed, automatically brings individual power supply channels up.
        Clear-Com Compatible
    • Specifications

      • General
      • AC Input: 100-240 VAC, 50/60 Hz
      • Channel Power (each channel): 24 ±1 VDC, 1 A
      • Dimensions: 1.75” (44.5 mm) high, 19” (483 mm) wide, 10.31” (261.9 mm) deep
      • Weight: approximately 4.5lbs (2kg)
      • Environmental Requirements: Storage: -20°C to 80°C; 0% to 95% humidity, noncondensing Operating: -15°C to 60°C; 0% to 95% humidity, noncondensing
        Program Input Connectors
      • Input Level: 100mV maximum
      • Voltage Gain: 25 ±3 dB
      • Output Level (to intercom channel): 1.0Vrms nominal, 2.3Vrms max.
      • Input Impedance: 75k ohms
      • Common Mode Rejection: Greater than 50 dB
      • Connector type: DB9F female, 9-pin D-Sub
        Intercom Channels, Balanced Mode (BAL/UNBAL
      • switch set to BAL)
      • Output Level: 1 Vrms nominal
      • Input Impedance: 300 ohms ±10%
      • Bridging Impedance: greater than 10,000 ohms
      • Sidetone: -40 dB, 35 dB adjustable range
      • Figure 4: - EMS-4001 sidetone adjustment locations.
      • Call Signaling: Send: 20 kHz ±100 Hz, 0.5 Vrms ±10%, Receive: 20 kHz ±800Hz, 100 mVrms
      • Mic-Kill Frequency: Send: 24 kHz ±100 Hz, 0.5 Vrms ±10%, Receive: 24 kHz ±800 Hz, 100 mVrms
      • Noise Contribution: less than -70 dB
      • Common Mode Rejection Ratio: greater than 50 dB
      • Connector type: One XLR-3M for each channel
      • Balanced Configuration Pinouts: Pin 1: DC/audio Common, Pin 2: Intercom audio low and +24 VDC output, Pin 3: Intercom audio high and +24 VDC output
        Intercom Channel, Unbalanced Mode (BAL/UNBAL
      • switch set to UNBAL)
      • Output Level: 2 Vp-p (750 mVrms)
      • Input Impedance: 200 Ohms ±10%
      • Bridging Impedance: greater than 10k ohms ±5%
      • Call Signaling: Send: 11 ±3 VDC, Receive: 4 VDC minimum
      • Connector Type: One XLR-3M for each channel- Pin 1: Common, Pin 2: +30 ±1 VDC output, Pin 3: Intercom audio high
        Expansion Input/Output
      • Connector Type: 1/8” Stereo phone jack,Tip: Talk output,Ring: Listen input, Sleeve: Common

    Add Accessories for your EMS-4001: