Sound Devices MM-1 Single Channel Portable Microphone Preamp


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  • Highly versatile and portable, Sound Devices' MM-1 is a single-channel, portable microphone preamplifier with a powerful headphone monitoring function. Proven in mission-critical applications, the high-performance microphone preamplifier uses a transformer-balanced input and output with a bipolar ±15 volt power supply to produce low-noise, low-distortion gain at all switch positions. It features an "unclippable" dual-stage limiter and two-position high-pass filter. Flexible microphone powering provides phantom power at 48 volts or 12 volts and 12-volt T-power. It is powered from two-AA batteries or external 5-18 VDC.

    The MM-1 is at home in high-definition television production, corporate/industrial environments, radio/television announce booths, and music production. Its headphone monitor is an advantage in applications where communications channels or mix-minus feeds need to be monitored in headphones. The user can monitor both microphone audio and external audio sources in headphones with level control.

    The MM-1 is designed to be durable. Its aluminum chassis, oversized end panels, machined knobs, and panel mounted connectors assure reliable mechanical operation.


    • Maximum of 66 dB of gain, in eleven discrete steps
    • Dynamic range exceeding 120 dB
    • 10 Hz to 50 kHz audio bandwidth
    • High immunity to RF interference
    • High current line output driver
    • Transformer-balanced input and output
    • Extended range peak limiter via dual opto-isolators makes preamplifier virtually "unclippable"
    • Selectable 48-volt / 12-volt phantom power or 12-volt “T" power
    • High-pass filter @ 80 or 160 Hz, 6 dB per octave
    • Headphone monitoring of microphone audio, monitor audio, or a mix of both
    • Monitor input accepts mono, balanced or unbalanced line-level inputs on 1/4-inch tip-ring-sleeve connector
    • Separate level control of Monitor gain and overall headphone gain
    • Split ear function via DIP switches
    • Internal battery power (two-AA)
    • Excellent battery life with alkaline and NiMH rechargeable batteries
    • External 5-17 VDC powering (plug included)
    • High-strength aluminum chassis with durable belt clip
  • Gain(Mic - Line): 0 dB to 66 dB input to output, switch selectable
    Frequency Response(Mic - Line) 20 Hz –20 kHz, +0.1, -0.5 dB, -1 dB at 50 kHz(relative to 1 kHz level with 150 ohm source)
    Equivalent Input Noise(Mic) -126 dBu (-128 dBV) maximum (150 ohm source, flat weighting, 22 Hz – 22 kHz bandwidth gain setting 36 dB or greater)
    Dynamic Range(Mic to Line) 122 dB minimum at the +18 dB gain setting
    THD + Noise0.05% maximum(from 50 Hz – 22 kHz @ +4 dBu output level, 22 Hz – 22 kHz filter bandwidth, +46 dB gain setting
    Gain Accuracy(Mic - Line) +0.6, -0.1 dB with reference to front panel gain markings (150 ohm source, 100 k load impedances)
    Output Clipping Level(Line) +22 dBu minimum with 100k ohm load+20 dBu minimum with 600 ohm load
    Input Clipping Level(Mic) +4 dBu minimum at the 0 or +18 dB gain setting
    Common Mode Rejection Ratio100 dB minimum at 80 Hz60 dB minimum at 10 kHz
    Weight0.7 kg (1.1 lbs)
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