The MP-1 from Sound Devices is a portable, battery-powered microphone preamplifier with phantom power. Designed for high definition field production environments, this studio-quality mic pre is ideal for critical radio, television, and film applications. With its rugged mechanical and electrical construction, compact size and high-quality components, the MP-1 is extremely durable and easy to use. This highly reliable mic preamp will provide years of superb audio performance under the most punishing field conditions.


Audio Performance

  • Maximum of 66 dB of gain, adjustable in eleven discrete steps for accurate, repeatable gain settings

  • Dynamic range exceeding 120 dB

  • 20 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 quality input transformer provides superior sonic quality and freedom from interference problems
  • Custom-designed output transformer provides line driving ability with freedom from interference problems


  • Extended range peak limiter via dual opto-isolators makes unit virtually "unclippable"

Battery Power

  • Internal battery power (two AA) for convenient, low cost power.
  • Battery life greater than 24 hours (phantom power off)

Durable Mechanical Construction

  • High strength extruded aluminum chassis with protective metal end rails to withstand punishing field conditions
  • Easy access battery compartment for quick battery changes

Phantom Power

  • Selectable 48-volt and 12-volt phantom power for condenser and dynamic microphones

High Pass Filter

  • Two selectable corner frequencies, 80 and 160 Hz, 6 dB per octave


0 dB to 66 dB input to output, switch selectable

Gain Accuracy:
+0.6, -0.1 dB with reference to front panel gain markings (150 Ohm source, 100k Ohm load impedances)

Frequency Response:
20 Hz - 22 kHz, +0.1, -0.5 dB, -1 dB at 50 kHz (relative to 1 kHz level with 150 Ohm source)

Equivalent Input Noise:
-126 dBu (-128 dBV) minimum (150 Ohm source, flat weighting, 22 - 22 kHz bandwidth, gain setting 36 dB or greater)

Output Clipping Level:
+22 dBu minimum with 100k Ohm load; +20 dBu minimum with 600 Ohm load

Input Clipping Level:
+4 dBu minimum at the 0 or +18 dB gain setting

Dynamic Range:
122 dB minimum at the +18 dB gain setting

THD + Noise:
0.05% Maximum (from 60 Hz to 22 kHz @ +4 dBu output level, 22 Hz - 22 kHz filter bandwidth, +46 dB gain setting)

Common Mode Rejection Ratio:
100 dB minimum at 80 Hz; 60 dB minimum at 10 kHz

Transformer-balanced, 2000 Ohm input impedance

Transformer-balanced, 130 Ohm output impedance

Low Cut:
80 Hz or 160 Hz (switch selectable), 6 dB per octave

Phantom Power:
12V or 48V (switch selectable) per DIN 45 596 specification

Limits to +17 dBu output level; 10:1 limiting ratio; 5 mS attack time, 100 mS release time; Amber/Red LED indicates limiting/clipping

Internal Voltage Rails:
+15 V and -15 V, regulated

2 AA batteries, 24 hours life typical with +4 dBu signal into 600 Ohms, no phantom power

Power LED:
Green indicates power and good battery. Red indicates power and low battery. LED turns red when approximately 4 hours of battery life remain.

Mic input to line output is non-inverting

Operating Temperature Range:
0 to 70 degrees C (32 to 160 degrees F)

43 mm x 94 mm x 140 mm (h x w x d) (1.7" x 3.7" x 5.5")

Weight (unit only):
0.56 kg (1.24 lbs.)

Weight (packaged):
0.86 kg (1.90 lbs.)

Meets FCC Part 15 Class B, Eligible to bear CE mark


MP-1 front and rear panels
Front and Rear Panels

Price: $455.00

For a .pdf version of the MP-1 User Guide, see the Sound Devices Product Index.
For technical notes on this product, see the Sound Devices Technical Notes page.


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Most recent revision January 1, 2015