Instruction Manual

MM-1 User Guide and Technical Information
2
Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
General Description
Sound Devices MM-1 combines a high-performance microphone preamplifier with a flexible
headphone monitor.
The full-featured, transformer-balanced microphone preamp produces 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.
The MM-1 is at home in a range of applications—film sound (boom operators), high-definition
television production, corporate/industrial environments, radio/television announce booths, and
music production. With its headphone monitoring function the MM-1 is a benefit in applications
where communications channels and 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 for durability. Its extruded aluminum chassis, rugged end panels, machined
knobs, and panel mounted connectors assure reliable mechanical operation.
Features
High Performance Microphone Preamplifier
• 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 Lundahl input transformer with superior sonic quality and freedom from interference prob-
lems.
• Extended range peak limiter via dual opto-isolators makes preamplifier virtually “unclippable”.
• Selectable 48-volt / 12-volt phantom power or 12-volt T-power for condenser microphones.
• High-pass filter with two selectable corner frequencies, 80 and 160 Hz, 6 dB per octave.
Headphone Monitoring
• Headphone monitoring of microphone audio, external monitor audio, or a mix of both.
• Monitor input accepts balanced or unbalanced mono line-level inputs on 1/4-inch tip-ring-sleeve connec-
tor.
• Separate level control of Monitor gain and overall headphone gain.
• Split ear function via DIP switches.
Portable
• Internal battery power (two-AA) for convenient, low cost power.
• Excellent battery life with alkaline or lithium primary cells.
• External 5–17 VDC powering (plug included).
Durable Mechanical Construction
• 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 and end panels.