MM-1 Microphone Preamplifier with Headphone Monitor User Guide and Technical Information Sound Devices, LLC E7556 State Rd. 23/33 • Reedsburg, WI • USA +1 (608) 524-0625 • fax: +1 (608) 524-0655 Toll-Free: (800) 505-0625 www.sounddevices.com support@sounddevices.
MM-1 User Guide and Technical Information 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.
MM-1 User Guide and Technical Information Specifications Gain: (Mic to Line) 0 dB to 66 dB input to output, switch selectable Gain Accuracy (Mic - Line) +0.6, –0.1 dB with reference to front panel gain markings (150 ohm source, 100k ohm load impedances) Frequency Response (Mic - Line) 20 Hz –20 kHz, +0.1, -0.
MM-1 User Guide and Technical Information Block Diagram Front Panel Controls and Connectors 1 3 4 1) Preamp Gain Switch (Rotary) 2) High-Pass Filter Switch 3) 4) 5) 4 2 5 Selects the amount of gain from input to output, adjustable in 11 increments. 6 7 6) Three-position switch inserts an 80 Hz or 160 Hz corner frequency filter, 6 dB per octave. Off position removes the filter from the signal path. 7) Limiter Switch 8) Activates the peak limiter. Limits to +17 dBu output.
MM-1 User Guide and Technical Information Back Panel Controls and Connectors 1 1) 2) 3) 4) 2 Line Out 3 4 5 6 7 5) Microphone Power Switch Active-balanced ¼-inch connector accepts balanced or unbalanced line level signals from -10 dBu to +24 dBu. 6) Battery Compartment Phantom Voltage Switch 7) Transformer-balanced line-level output. +22 dBu peak output level. Mic In Transformer-balanced XLR input accepts microphone level signals.
MM-1 User Guide and Technical Information Operational Notes Transformers The isolation characteristics of transformers are superior to any other balancing technique, particularly for the adverse and uncontrolled environments of field production. Transformers provide galvanic isolation from the driving source, meaning there is no direct electrical connection. Signals are “transformed” magnetically.
MM-1 User Guide and Technical Information Headphone Monitoring With headphones connected to the front panel headphone jack the MM-1 can be used to monitor either microphone audio, monitor audio, or a mix of both signals. The Phones level controls the overall headphone volume. The Monitor Gain adjusts the level of the monitor input signal. The MM-1 is capable of driving headphones to dangerously high levels. Take precautions to prevent hearing damage.
MM-1 User Guide and Technical Information Application Notes Line Driving/Mic Checking Audio from remote microphones located more than 100 meters from a mixing console improve when sending line level signals to the mix position. Long cable runs at microphone level are more prone to noise and interference than line level signals. Phantom voltages can also drop over long cable runs—resulting in problems at the microphone.
MM-1 User Guide and Technical Information Radio/Television Announcer Position The MM-1 is used as a microphone preamplifier for an announcer’s microphone and can pass a mixminus headphone feed to the announcer. Sending a line level signal from the announcer position to the main mixing console is preferred over sending a mic level signal. When engaged, the limiter prevents distortion during shouting and high microphone signal levels.
MM-1 User Guide and Technical Information CE Declaration of Conformity According to ISO/IEC Guide 22 Sound Devices, LLC E7556 State Rd. 23/33 Reedsburg, WI 53959 USA declares that the product, MM-1 is in conformity with and passes: EN55103-1, 1997 EMC-product family standard for audio, video, audio-visual and entertainment lighting control apparatus for professional use.
MM-1 User Guide and Technical Information FCC Statement This device has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
MM-1 User Guide - Printed in U.S.A.