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MP221 Microphone preamp

The MP221 preamplifier is a high performance unit built to broadcast standards. Primarily designed to add flexibility to Ampetronic Induction Loop installations, it can also be used in other professional audio systems where the control and mix of audio signals is required.

The MP221 is a four input preamplifier, 2 XLR microphone inputs with phantom power and 1 line level input for balanced or unbalanced connection and a twin unbalanced phono input. The single electronically balanced output can be connected to balanced or unbalanced loads.

The inputs are fully protected. In the event of an overload condition of any amplifier section, the overload warning LED will illuminate.

Input Signal Management and Control

To increase input options for induction loop systems or for other general mixing arrangements.


Product Code:

  • Features
  • Specifications
  • Standards
  • Downloads
    • Switchable phantom power
    • Independent controls for all inputs
    • 5 year warranty
    • Power supply included
    • 2 Balanced microphone inputs
    • 1 Balanced/Unbalanced line input
    • 1 Stereo Unbalanced line input
    • 1 Balanced/Unbalanced line output
  • Balanced Microphone Inputs

    Gain (Factory setting)66dB
    Gain switch(low) 46dB
    Input referred noise-124dBu (200Ω source)
    Input impedance> 5kΩ
    Phantom Power+12V

    Line Level Input 1 Unbalanced Stereo

    ConnectorDual phono
    Input Impedence47k Ω

    Line-level Input 2 Balanced / Unbalanced

    Connector(1/4 inch) 6.3 mm jack socket
    Input impedance1MΩ each side, 2MΩ differential


    Connector(¼ inch) 6.3mm Jack socket
    Number1 Balanced/Unbalanced
    Level0dBu (nominal)
    Overload+16dBu Bal / +10 dBu Unbal
    Overload LEDOn front panel


    Gain Control4 (1 per input) on front panel
    PhantomGlobal ON/OFF on rear panel
    Gain BoostInternally selectable per channel


    Width, Depth, Height107 x 200 x 44mm

    Power Supply

    Voltage, Current12Vdc, 55mA (region specific power supply included)


    The unit can be rack mounted using the RM-1U rack tray, BPS-1U and BPL-1U blank plates.

  • The MP221 preamplifier is CE marked to all relevant safety and EMC standards

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