Sound Devices MM-1

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 + 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 Hz, 60 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)