SOUND DEVICES
MM-1 MICROPHONE PREAMPLIFIER WITH HEADPHONE MONITORING

Sound Devices MM-1 is a single channel of our highly praised microphone preamplifier circuitry with a flexible headphone monitoring function.

The full- featured, transformer-balanced microphone preamp uses high-quality parts and a bi-polar ±15 volt power supply to produce low-noise, low-distortion gain at all switch positions. Its dual-stage limiter and high-pass filter prevent occasional signal extremes from overloading down-stream equipment. Flexible microphone powering can power phantom powered microphones at 48 volts or 12 volts and 12 volt "T" power.

The MM-1 is at home in a range of applications - high-definition television production, corporate/industrial environments, radio/television announce booths, and music production. With its headphone monitoring function the MM-1 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 extruded aluminum chassis, oversized end panels, machined knobs, and panel mounted connectors assure reliable mechanical operation.

FEATURES:

• Maximum of 66 dB of gain, in eleven discrete steps for accurate, repeatable gain settings
• Dynamic range exceeding 120 dB
• 10 Hz to 50 kHz audio bandwidth
• High immunity to RF interference due to transformers, RF filtering, and all-metal construction
• High current line output driver capable of driving very long cable runs
• Premium input transformer with superior sonic quality and freedom from interference problems.
• Extended range peak limiter via dual opto-isolators makes preamplifier virtually "unclippable"
• Selectable 48-volt / 12-volt phantom power or 12-volt ³T power² for condenser microphones
• High-pass filter with two selectable corner frequencies, 80 and 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 overal headphone gain
• Split ear function via DIP switches

• Internal battery power (two-AA) for convenient, low cost power.
• Excellent battery life with Alkaline and NiMH rechargeable batteries.
• External 5-17 VDC powering (plug included).

• High strength aluminum chassis withstands punishing field conditions
• Panel-mounted connectors for strength and reliability
• Easy access battery compartment for quick battery changes
• Durable belt clip for easy mounting

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i© 1997 Posthorn Recordings