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Dunlop positioned the MXR Bass D.I. Plus (M80-U) as a combined direct-injection box and signal-processing pedal aimed at bass players requiring both clean and distorted tones in a single unit. It provided a D.I. output alongside dedicated clean and distortion channels, placing it in the working-bassist utility category rather than as a single-purpose effect.
The unit offered three-band tone shaping — bass at 60 Hz, mid at 850 Hz, and treble at 4 kHz — with substantial cut and boost ranges on each band. A built-in noise gate with an adjustable trigger range of 28 dB addressed hum and hiss on the distortion channel; the gate's noise floor measured at -98 dBV with gate engaged, matching the clean channel's -98 dBV noise floor. The volume control spanned a 40 dB range. Input impedance measured 2.2 MΩ, with separate unbalanced and balanced output impedances of 150 Ω and 300 Ω respectively. The bypass circuit was buffered. The M80-U ran on a 9-volt DC supply and drew 9 mA.
Owners tracing a signal-chain issue, verifying output impedance compatibility with a mixing console, or sourcing a replacement power supply should consult the original Dunlop specification sheet for their unit and, for any internal service, bring the pedal to a qualified electronics technician.
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