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Dunlop positioned the MXR M81-U Bass PreAmp as a compact, pedalboard-format preamp designed for both live performance and direct recording applications. It combined an onboard bass preamp with a balanced Direct Out, allowing a bass signal to be conditioned and routed simultaneously to a stage amplifier and a recording interface or mixing console.
The unit provided a three-band EQ section with wide boost-and-cut ranges across Bass, Mid, and Treble bands, with the Mid band featuring a sweepable centre frequency. An Input control operated pre-EQ and an Output control operated post-EQ. Both a standard 1/4" output and a balanced XLR-format Direct Out were present, with the balanced output capable of accepting phantom power. Bypass was handled by a true hardwire buffer rather than a relay or DSP switching circuit. The pedal drew 8.5 mA from a standard 9-volt DC supply under normal operation, dropping to 5 mA when powered via phantom power.
Owners requiring replacement footswitches, DC power jacks, or XLR output hardware should consult a qualified guitar or electronics technician, as internal component sourcing for discontinued units can vary; a technician familiar with MXR-format pedal construction will be best placed to advise on compatible parts.
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