Benchmark MPA1 No Longer Available

2-channel Microphone Preamplifier with 38-position Stepped Gain Control, 74dB Gain, Switchable Phantom Power, and Phantom-power Protection Circuitry
Item ID: MPA1

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Benchmark MPA1 image 1
Benchmark MPA1 image 1

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Benchmark MPA1
Special Order

Clean Preamplification - Perfect for Stereo Pairs!

Benchmark designed the MPA1 to bring you two extremely transparent channels of audio. It's ideal for use with stereo pairs, ribbon microphones - and any application where you demand purity from your microphone preamplifier. The MPA1's unique stepped-input control lets you adjust gain in 38 steps, so you can adjust each of the two preamplifiers in the same way. Each step gives you 2dB, for a healthy total of 74dB of gain. And, for critical instrument miking applications, you can also expect excellent low-end phase accuracy, with Benchmark's MPA1.

Benchmark MPA1 2-channel Microphone Preamplifier at a Glance:
  • Carefully designed for purity and transparency
  • Exceptional, phase-accurate low-frequency performance
  • 38-position gain control for repeatable results
  • Sophisticated phantom power protection
Carefully designed for purity and transparency

Benchmark engineered the MPA1 with transparency and purity in mind - its two channels are perfect for critical stereo-miking applications. Onboard, the input stage features 29dBu of high-voltage headroom, as well as single-stage gain control, to maximize the signal-to-noise ratio. To achieve this superb noise performance across the entire gain range, Benchmark uses precision-matched, low-noise, transistor quad-arrays, plus a servo-controlled circuit to minimize DC-offset and maximize headroom.

Exceptional, phase-accurate low-frequency performance

When you need accurate low-frequency performance, you can depend on Benchmark's MPA1 microphone preamplifier. It features a special dual-capacitor AC-coupling design, which defeats the limits of single-capacitor AC-coupling, ultimately giving you an exceptionally low corner-frequency with excellent subsonic phase accuracy.

38-position gain control for repeatable results

The Benchmark MPA1 features a unique gain control circuit. It has a 38-position, switched-resistor ladder - for repeatable performance - that's set up in a continuously rotation orientation via relay control. Each step offers 2dB of gain, taking you from 0dB to 74dB of gain, without attentuation. It has an inter-channel gain precision of +/- .03dB, so you can count on the MPA1 for matched preamplification from channel to channel.

Sophisticated phantom power protection

Benchmark equipped the MPA1 with protection from phantom power surges, via an ultra-fast, multi-stage protection circuit. This circuit takes advantage of 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/unplugged microphones when phantom power is engaged. The circuit is pre-biased, as well, so it's isolated from the circuit when used normally, but activated if a surge occurs.

Benchmark 2-channel MPA1 Microphone Preamplifier Features:
  • 38-position discrete linear gain switching (2dB / step)
  • Automatic gain-range switching with LED range-indicators
  • 0-74dB total gain range
  • Switchable 40Hz highpass 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, toroidal linear power supply
  • High-quality gold Neutrik connectors
  • Maximum input: +29 dBu
  • Maximum output: +29 dBu
  • Ultra-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
The Benchmark MPA1 delivers two channels of transparent preamplification!

What Does "Special Order" Mean?

A special-order product is one that we don't normally keep in stock. We order it from the manufacturer as soon as you order from us. We have great relationships with all the manufacturers we carry, so we can get your special order to you as fast as or faster than anyone else. Remember that special orders are non-returnable and non-cancelable, so make sure the item is right for you. A Sweetwater Sales Engineer can help you decide — call (800) 222-4700 for assistance!

Tech Specs

Manufacturer Part Number 500-14600-000

Customer Reviews

Based on 2 reviews
See also: Benchmark, Benchmark Preamps