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| Benchmark MPA1 |
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Benchmark MPA1
The Benchmark MPA1 Microphone Preamplifier is a 2-channel microphone preamplifier designed and manufactured by Benchmark Media Systems, Inc. The MPA1 is meticulously designed to Benchmark standards of transparency, ultra-low distortion, and ultra-low noise performance - making the MPA1 a perfect choice for stereo pairs, ribbon mics, and any other application where purity is the goal.
Benchmark MPA1's featuresPristine Input Stage
The input stage of the MPA1 is designed with high-voltage headroom (+29 dBu) and single-stage gain control to maximize 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 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-beforebreak scheme creates a silent switching circuit.
Elegant Phantom Power Protection
The transistor stage is protected from phantom power surges with an ultra-fast, multi-stage 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
Benchmark MPA1's specifications38-positions discrete linear gain switching (2 dB/step)Automatic gain-range switching with LED range-indicators0-74 dB total gain rangeSwitchable 40-Hz high-pass filter (relay controlled - no audio through switches)Switchable polarity invert (relay controlled-no audio through switches)Independently switchable +48V phantom powerHPA2-Benchmark's signature high-current, 0-Ohm headphone amplifier4-segments, precision LED meters (calibration-free)Recessed phantom switch to prevent accidental switchingPhantom-power disable jumper for dedicated ribbon mic operationPhantom-protection circuitry prevents damage from phantom-power surgesInternal, toroidal linear power supplyHigh-quality gold Neutrik connectorsMaximum input: +29 dBuMaximum output: +29 dBuUltra-low noise/distortion: (THD+N @ 22dB Gain 10Hz-20kHz = 0.00045%)RF-immunity over a wide bandwidth (500kHz)Designed, built, and tested in Syracuse, New York, USA
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Studio Economik UA Apollo NEWS! We are placing the 1rst order for UA Apollo right now, available end February. Limited quantity available on first shipment. Pre-orders available. Please contact us to get yours!
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