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Dunlop positioned the MXR Bass Chorus Deluxe (M83-U) as a full-featured analog chorus unit aimed specifically at bass players. It offered a wider tonal toolkit than a standard chorus pedal, incorporating Bass and Treble controls acting on the delay signal only, a Flanger switch, and an X-Over switch — the latter allowing the dry signal to pass unmodulated through the low end while chorus or flange effect was applied to the upper frequencies.
The unit operated on 9 volts DC at 30 mA draw. Rate could be swept from 0.1 Hz to 10 Hz, with delay time ranging from a minimum of 400 µs to a maximum of 12 ms. A 2:1 delay noise reduction circuit was included. Input impedance was 2 MΩ; output impedance differed by output type — 600 Ω on the TIP (mono) output and 3.3 KΩ on the RING (stereo) output. Bypass mode was true hardwire on the mono path and hardwired on the stereo path. Frequency response was rated at 20 Hz to 20 kHz ±1 dB, with a signal-to-noise ratio exceeding 96 dBV.
Owners sourcing a replacement power supply should confirm the 9-volt DC specification and current draw before substituting any adapter. For questions about internal calibration, switch servicing, or output jack replacement, a qualified guitar or electronics technician familiar with effects units is the appropriate resource.
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Dunlop
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Since 2007
