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EWI MST-103 Single Channel by Three Way Isolated XLR Transformer Splitter



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The EWI MST-103 Mic Splitter splits a signal from a low-impedance microphone (or similar source) into three outputs, enabling three microphone preamplifiers to be fed from one source. Some applications include musicians' on-stage monitoring, live recording, ENG use at press conferences, and videotaping of lectures, public speeches, etc. It can also be used simply as an isolation transformer for long microphone lines feeding unbalanced inputs, or for any audio signal up to 0 dBv (.775 volt). Transformer isolation in such situations minimizes interference from SCR lighting dimmers, radio transmitters, and 60 Hz AC power wiring. The transformer-isolated feeds retain the advantage of common-mode noise rejection inherent in the use of balanced lines. The MST-103 is fitted with standard 3-pin XLR-type connectors for INPUT, DIRECT OUTPUT, and ISOLATED OUTPUTS 1 and 2, so hookup requires only standard microphone cables. The use of the MST-103 transformer allows the MST-103 to provide two floating, low-impedance outputs with wide, flat frequency response, ultra-low distortion, and no ringing or overshoot to degrade transient response. The transformer's triple electrostatic shields and GND/LIFT switches provide isolation and buzz-free operation in virtually any environment.


  • Provides 3-Way Split for Low-Z Microphone
  • Great for Musicians' Monitoring and Recording
  • ENG Uses Include Press Conferences and Speeches
  • Connects with Standard Mic Cables
  • High-Quality Transformer-Isolated Output

    Warranty: 5 Years

    FREQUENCY RESPONSE : 20 Hz-20 kHz, +/- .25 dB @ -15 dBv output. -3 dB @ approximately 140 kHz.
    TOTAL HARMONIC DISTORTION : Less than .03% 20 Hz-20 kHz @ -30 dBv output. Less than .1% 30 Hz-20 kHz @ -15 dBv output. Less than .25% 20 Hz-20 kHz @ -15 dBv output.
    PHASE RESPONSE : Less than -13 degrees @ 20 kHz (ref. 1.0 kHz).
    RISE TIME: Less than 2.4 microseconds (2.0 kHz square wave, 10%-90%).
    INPUT IMPEDANCE: Greater than 570 ohms @ 1.0 kHz. Greater than 570 ohms @ 10 kHz. The nominal source impedance is 150 ohm.
    OUTPUT IMPEDANCE: Less than 255 ohms @ 1.0 kHz. Less than 270 ohms @ 10 kHz. The nominal load impedance is 1.0 ohm.
    VOLTAGE LOSS : Less than 2.5 dB @ 1.0 kHz.
    MAXIMUM INPUT LEVEL FOR 1% THD : 0 dBv @ 20 Hz. +4 dBv @ 30 Hz. +8 dBv @ 50 Hz.
    DIMENSIONS : 82mm(W) x 44mm(H) x 130mm(D)
    WEIGHT : 0.45 Kg

    To download the ISOBOX-2 manual please click here.

    Order weight is calculated on whichever of the dead (actual) or volumetric weight is the greatest. As of 10/9/21 capped $8.80 to $16.50 for up to 20kg to most areas. For orders under $50 options are Standard Postage $8.80 or Express Shipping for $16.50. Orders over $1,000 ship for free. Express Shipping covers one delivery attempt so please provide an address where someone is available to sign for courier delivery between 9am and 5pm weekdays. You can instruct us to ask the courier to leave your parcel unattended in a safe place, although please be aware that if anything happens to the parcel, neither us nor the courier company can be held responsible. Work addresses are a great delivery option. If using a work address please include the business' name.

    * for some larger items does not apply to Australian remote island locations, some mainland remote locations (outside Darwin NT and Perth WA metro areas) or outside Australia. If unsure if you are entitled to capped shipping it is best to contact us prior to placing order.

    Type: Cables