DISC Benchmark MPA1 2-Channel Mic Preamplifier

Full Description

The MPA1's input stage features high-voltage headroom at +29dBu, and single-stage gain control. It offers superb noise performance across the entire gain range thanks to its precision-matched, low-noise transistor quad-arrays, while the servo-controlled circuit minimises DC-offset and maximises headroom.

The exceptional low-frequency performance of the MPA1 comes from its dual-capacitor AC-coupling design. This defeats the usual limitations of single-capacitor designs, giving an exceptionally low corner-frequency with excellent subsonic phase-accuracy.

The MPA1 also boasts a unique gain control, using a 38-position switched resistor ladder set up in a continuously rotating orientation via relay control. It offers 2dB per step, 0-74dB of gain without attenuation and inter-channel gain precision of +/- 0.03dB.

Phantom power surges are kept away from the transistor stage by an ultra-fast, multi-stage protection circuit. Using high-speed, low-capacitance Schotky diodes and high-current TVS diodes, it absorbs phantom power surges and is pre-biased to be isolated from the circuit in normal operation and activated when a surge occurs.

The MPA1 is designed for rack mounting. It occupies half of a rack space, and can be mounted alone using Benchmark's rack mount kit, or in conjunction with another Benchmark module using the rack mount coupler.

Features/Specifications:

• 2-channel microphone preamplifier
• High-voltage headroom (+29dBu)
• Single-stage gain control (74dB gain range)
• Dual-capacitor AC-coupling design
• Stepped-resistor gain control (2dB per step)
• Phantom power protection