Product Description

Designed for high-definition field production environments, the MP-1 is an ideal studio-quality mic pre for critical radio, television, and film applications.

The MP-1 is extremely durable and easy to use. With rugged mechanical and electrical construction and high-quality components, it will provide years of superb audio performance under the most punishing field conditions.

Simple to Use

The MP-1 provides up to 66 dB of clean, nearly noiseless gain. Its transformer-balance microphone preamplifier offers a two-position highpass filter, extended range, selectable peak limiter, and 48 V phantom power, ensuring superior sonic quality and freedom from interference problems.

MP-1 Key Features
  • Superb audio specifications
  • 66 dB of gain, in eleven discrete steps
  • Transformer-balanced input and output
  • Phantom power – 48 volt or 12 volt
  • High pass filter @  80 Hz or 160 Hz, 6 dB/octave
  • Limiter makes unit virtually “unclippable”
  • High current line output drive
  • Excellent immunity to RF interference.
  • Battery power (two x AA)
  • Durable mechanical construction
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Additional Information

Frequency Response

20 Hz to 22 kHz, +0.1, -0.5 dB; -1 dB at 50 kHz (relative to 1 kHz level with 150 ohm source)


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)

Equivalent Input Noise

-126 dBu (-128 dBV) maximum (150 ohm source, flat weighting, 22 – 22 kHz bandwidth, gain setting 36 dB or greater)

Input Clipping Level

+4 dBu minimum at the 0 or +18 dB gain setting

Output Clipping Level

+22 dBu minimum with 100k ohm load
+2- dBu minimum with 600 ohm load

Dynamic Range

122 dB minimum at the +18 dB gain setting

THD + Noise

0.05% maximum (from 50 Hz to 22 kHz @ +4 dBu output level, +46 dB gain setting)

Common Mode Rejection Ratio

100 dB minimum at 80 Hz, 60 dB minimum at 10 kHz


Transformer-balanced, 2k ohm input impedance


Transformer-balanced, 130 ohm output impedance

Low Cut

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

Phantom Power

12 V or 48 V (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, 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 hour 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 5.55")

Weight (unit only)

0.56 kg, 1.24 lbs.

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