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Sound Devices MM-1 Microphone Preamp with Headphone Monitor

Single-channel, portable microphone preamplifier with a powerful headphone monitoring function

Sound Devices MM-1 Microphone Preamp with Headphone Monitor

Sound Devices MM-1 Microphone Preamp with Headphone Monitor

Single-channel, portable microphone preamplifier with a powerful headphone monitoring function

SKU: MM-1

Cat no: 5490

  • 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
Price match

Estimated Delivery 1 to 2 days

£550.00 (ex vat) £660.00 (incl vat)

Sound Devices MM-1 Microphone Preamp with Headphone Monitor


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.

Key Features

  • 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

Product Specification


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 + Noise 0.05% 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 Ratio 100 dB minimum at 80 Hz60 dB minimum at 10 kHz
Weight 0.7 kg (1.1 lbs)
Dimensions 49 mm x 95 mm x 166 mm, 1.95" x 3.75" x 6.55" (h x w x d)

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