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Dunlop positioned the MXR Bass Envelope Filter (M82-U) as an analog envelope filter designed specifically for bass guitar. It sat within the MXR effects line as a dedicated low-frequency variant of the envelope filter format, offering separate Dry and Effect level controls to allow the unfiltered bass signal to be blended with the filtered output.
The unit operates on a true hardwire bypass circuit and draws 6 mA from a 9-volt DC power supply. The filter sweep runs from 76 Hz to 3.2 kHz, with a sensitivity range of 46 dB and a decay stop frequency adjustable between 76 Hz and 1.3 kHz. Input impedance is rated at 1 MΩ and output impedance at 100 Ω. The Effect level control spans from fully attenuated to 0 dB, while the Dry control extends to +6 dB, enabling the low-end fundamental to sit above the wet signal when needed.
Owners requiring service, recalibration, or troubleshooting on the M82-U should consult a qualified electronics technician familiar with analog effects circuitry.
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Since 2007
