Product Description

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.

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 5-17 VDC, such as via the PIX-E PSU.

MM-1 Key Features
  1. Maximum of 66 dB of gain, in eleven discrete steps
  2. Dynamic range exceeding 120 dB
  3. 10 Hz to 50 kHz audio bandwidth
  4. High immunity to RF interference
  5. High current line output driver
  6. Transformer-balanced input and output
  7. Extended range peak limiter via dual opto-isolators makes preamplifier virtually “unclippable”
  8. Selectable 48-volt / 12-volt phantom power or 12-volt “T” power
  9. High-pass filter @ 80 or 160 Hz, 6 dB per octave
  10. Headphone monitoring of microphone audio, monitor audio, or a mix of both
  11. Monitor input accepts mono, balanced or unbalanced line-level inputs on 1/4-inch tip-ring-sleeve connector
  12. Separate level control of Monitor gain and overall headphone gain
  13. Split ear function via DIP switches
  14. Internal battery power (two-AA)
  15. Excellent battery life with alkaline and NiMH rechargeable batteries
  16. External 5-17 VDC powering
  17. High-strength aluminum chassis with durable belt clip
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Additional Information


(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


0.7 kg (1.1 lbs)


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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