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Item # 105792832

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Benchmark MPA1 2-Channel Mic-Pre
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      Benchmark MPA1 2-Channel Mic-Pre (105792832)
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A perfect choice for stereo pairs, ribbon mics, and any other application where purity is the goal.

The 2-channel Benchmark MPA1 microphone preamplifier is meticulously designed to Benchmark standards of transparency, ultra-low distortion, and ultra-low noise performance. The MPA1 mic pre is a perfect choice for stereo pairs, ribbon mics, and any other application where audio purity is the goal.

Pristine Input Stage
The Benchmark MPA1 mic pre's input stage offers high-voltage headroom (+29 dBu) and single-stage gain control to maximize the signal-to-noise ratio. The MPA1 maintains superb noise performance across the entire gain range (74 dB) by utilizing precision-matched, low-noise, transistor quad-arrays. A servo-controlled circuit minimizes DC-offset and maximizes headroom.

Complete Low Frequency Response
The MPA1 exhibits exceptional low-frequency performance with a clever dual-capacitor AC-coupling design. This dual-capacitor design defeats the limitations of single-capacitor AC-coupling designs, achieving an exceptionally low corner-frequency with excellent subsonic phase-accuracy.

Innovative Stepped-Resistor Gain Control
The gain control of the Benchmark MPA1 is completely unique. The gain is controlled via a 38-position, switched resistor ladder, set up in a continuously rotating orientation via relay control. This gain control circuit offers 2 dB per step, 0-74 dB of gain without attenuation, and inter-channel gain precision of +/- 0.03 dB. A make-before-break scheme creates a silent switching circuit.

Elegant Phantom Power Protection
The transistor stage is protected from phantom power surges with an ultra-fast, multistage protection circuit. This circuit utilizes the high-speed capabilities of low-capacitance Schotky diodes and the high-current capabilities of TVS diodes to absorb the phantom power surges caused by shorts and plugging/unplugging microphones with +48V on. This circuit is pre-biased so that it is isolated from the circuit in normal operation and activated when a surge occurs.


For mounting options, see RM Kit #485682, RM Coupler #485683, and RM Blank #485683.

Benchmark MPA1 2-Channel Mic-Pre Features:

  • 38-position discrete linear gain switching (2 dB/ step)
    Automatic gain-range switching with LED range-indicators
    0 74 dB total gain range
    Switchable 40-Hz high-pass filter (relay controlled – no audio through switches)
    Switchable polarity invert (relay controlled – no audio through switches)
    Independently switchable +48V phantom power
    HPA2 – Benchmark's signature high-current, 0 Ohm headphone amplifier
    4-segment, precision LED meters (calibration-free)
    Recessed phantom switch to prevent accidental switching
    Phantom-power disable jumper for dedicated ribbon mic operation
    Phantom-protection circuitry prevents damage from phantom power surges
    Internal, toridal linear power supply
    High-quality gold Neutrik connectors
    Maximum input +29dBu
    Maximum output: +29dBu
    Ultra-low noise/distortion (THD+N @ 22dB Gain 10Hz to 20kHz=0.00045%)
    RF-immunity over a wide bandwidth (500kHz)
    Designed, built, and tested in Syracuse, New York, USA




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