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Sound Devices MM-1 – Portable Microphone Preamplifier

Name: Sound Devices MM-1 – Portable Microphone Preamplifier
Brand: Sound Devices
SKU: MM-1
Price: 870 GBP
Availability: InStock

£725.00 (ex VAT)

£870.00 (inc VAT)

SKU: MM-1

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Sound Devices MM-1 – Portable Microphone Preamplifier

The Sound Devices MM-1 is a compact, battery-powered single-channel microphone preamplifier with integrated headphone monitoring, designed for broadcast, television, radio and production applications.

Its high-performance transformer-balanced input and output provide clean, low-noise, low-distortion gain, while flexible microphone powering supports 48 V or 12 V phantom power and 12 V T-power. An unclippable dual-stage limiter and two-position high-pass filter provide additional control and protection.

The MM-1's versatile headphone monitor allows users to monitor both microphone audio and external audio sources, making it particularly useful for communications channels, mix-minus feeds and announce booths.

Built for professional use, the MM-1 features a durable aluminium chassis, machined controls and panel-mounted connectors. It can be powered by two AA batteries or an external 5–17 VDC power source.

What's in the Box:

MM-1 Mic Preamp
Coaxial female power connector
4 Adhesive rubber “bumpers”

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
High-strength aluminium chassis with durable belt clip

Gain	0–66 dB, switch selectable
Frequency Response	20 Hz–20 kHz, +0.1/-0.5 dB; -1 dB at 50 kHz
Equivalent Input Noise	-126 dBu maximum (150 Ω source, flat weighting, 22 Hz–22 kHz bandwidth, gain ≥36 dB)
Dynamic Range	122 dB minimum at +18 dB gain
THD + Noise	0.05% maximum, 50 Hz–22 kHz @ +4 dBu output, +46 dB gain
Gain Accuracy	+0.6/-0.1 dB relative to front-panel gain markings
Input Clipping Level	+4 dBu minimum at 0 or +18 dB gain
Common Mode Rejection Ratio	100 dB minimum @ 80 Hz; 60 dB minimum @ 10 kHz
Output Clipping Level	+22 dBu minimum into 100 kΩ load; +20 dBu minimum into 600 Ω load
Dimensions (H × W × D)	49 × 95 × 166 mm / 1.95 × 3.75 × 6.55 in
Weight	0.7 kg / 1.1 lbs