EWI MST-412 4 Channel by Three Way Isolated XLR Rack-Mountable Transformer Splitter



NEW model arriving late JUNE 2024 - the upgraded MST-412A will an extra DIRECT OUT (2) on the rear panel. Download new spec sheet.

The MST-412 Quad Mic Splitter splits the signals from each of four low-impedance microphones (or similar sources) into three outputs, enabling three microphone preamplifiers to be fed from one source. The primary application for the MST-412 is in large sound reinforcement systems, where the P.A. system microphones must also be fed to a stage monitor system and broadcast or remote recording mixer. In such complex systems grounding problems can cause both unacceptable noise levels and severe shock hazards. 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-412 is fitted with standard 3-pin XLR-type connectors for MIC IN, DIRECT, and ISO OUT 1 and 2, so hookup requires only standard microphone cables. The use of the MST-412 transformer allows the MST-412 to provide 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.

The MST-412 can be mounted in any standard 19" (482.6mm) rack. Top-quality connectors and switches provide trouble-free service even in abusive situations such as remote broadcast and recording operations. The rack-mounting design allows the user to assemble a conveniently packaged expandable splitting system that combines top-quality audio performance and isolation at an economical price.


■ Provides 3-Way Split for Low-Z Microphones
■ 4 Splitter Channels in Single Rack Space
■ Allows Assembly of Economical Expandable Splitting System
■ Great for Musicians' Monitoring, Remote Recording and Broadcast
■ Connects with Standard Mic Cables
■ High-Quality Transformer-Isolated Outputs

      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.
      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 ohm @ 1.0 kHz. Less than 270 ohm @ 10 kHz. Nominal load impedance is 1.0 kohm. > 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.
      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%).
      DIMENSIONS : 83mm(W) x 44mm(H) x 98mm(D)
      WEIGHT: 1.4 Kg

      NOTE: Phantom power (if required) must be supplied by a mixer (or suitable power supply) connected to LOOP output.

      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.