The MP-1: Portable, battery-powered microphone preamplifier with phantom power
Designed for high-definition field production environments, the studio-quality MP-1 is an ideal line-driver 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.
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
-126 dBu (-128 dBV) maximum (150 ohm source, flat weighting, 22 - 22 kHz bandwidth, gain control set at 50% or higher, phantom power off)
Output Clipping Level (Line)
+22 dBu minimum with 100k ohm load, +20 dBu minimum with 600 ohm load
110 dB minimum
THD + Noise
0.05% maximum (from 60 Hz to 22 kHz @ +4 dBu output level, 22 Hz - 22 kHz filter bandwidth, gain control at 50%, phantom off)
Transformer-balanced, 2k ohm input impedance
s/n < 0507 - impedance-balanced, 120 ohm output impedance, s/n >0507 - active-balanced, 120 ohm output impedance
Unbalanced, tip-left, ring-right, sleeve-ground, 2.4k ohm output impedance
2 AA alkaline batteries, 6 hours life typical with +4 dBu signal into 600 ohms, no phantom power
Green indicates power and good battery. Red indicates power and low battery. LED turns red when approximately 1 hour of battery life remain (with phantom power off). Green with external DC power.
20 Hz - 30 kHz, +0.1, -0.5 dB; -1 dB at 5 Hz & 50 kHz (relative to 1 kHz with 150 ohm source, gain controls set at 50%)
Input Clipping Level
-10 dBu minimum
Output Clipping Level (Tape)
+11 dBu (2.75 V RMS) minimum with 100k ohm load
Common Mode Rejection Ratio
100 dB minimum at 80 Hz, 60 dB minimum at 10 kHz
Greater than 80 dB at 1 kHz (gain controls set to 50%)
80 Hz or 160 Hz (switch selectable), 6 dB per octave
48 V through 6.8k resistors or 15 V through 680 ohm resistors (switch selectable)
Thresholds adjustable per channel from -10 dBu to +17 dBu, 10:1 limiting ratio, 5 mS attack time, 100 mS release time, Amber/Red LED indicates limiting/clipping, Dual mono or stereo linked
Internal Voltage Rails
±15 V, regulated
All inputs to all outputs, non-inverting. Pin-2 of XLRs "hot" to unbalanced inputs and outputs.
Seven segment GaN (Gallium Nitride) LED meter with three intensities, peak responding
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)
0.8 kg, 2.0 lbs.
1.2 kg, 3.0 lbs.
Meets FCC Part 15 Class B, eligible to bear CE mark