MXR M82 Bass Envelope Filter
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The essentials to know about the MXR M82 Bass Envelope Filter pedal
The essentials to know about the MXR M82 Bass Envelope Filter pedal
- Ultra-dynamic analog envelope filter: the filter sweep follows your attack for instant funk grooves.
- Preserved lows thanks to the dual Dry/FX volume: you keep the bass foundation even with a very pronounced effect.
- Adjustable sensitivity to suit both passive and active basses, from fingerstyle to slap.
- True hardwire bypass: direct signal preserved when the pedal is off.
Manufacturer Information
MXR
https://www.jimdunlop.com
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Algam SAS
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An auto-wah tailored for bass, blending vintage spirit and modern precision
An envelope filter (often called "auto-wah") recreates the effect of a wah-wah... without an expression pedal: your playing triggers the opening and closing of the filter. The MXR M82 adopts this iconic principle and makes it particularly usable on bass: fast response, effective controls, and above all, a direct signal management designed to preserve the low end. The result: you get the funky, bouncing "quack" of the classics while maintaining a modern definition that remains clear in a busy mix.For which bassists, styles, and contexts?
The M82 Bass Envelope Filter targets bassists who want to bring expression and movement back into their lines: funk, disco, fusion, rock, hip-hop, electro, neo-soul... In the studio, it highlights articulation (ghost notes, pick, aggressive back-and-forth) and gives an immediate signature to repetitive riffs. Live, the Dry/FX blend helps stay locked in with the kick drum, even when the envelope is wide open: ideal for a compact and efficient pedalboard.Technical specifications
| Effects | Bass, Envelope / Auto-wah | EQ | Filter |
| Technology | Analog | Settings | dry, FX, Q, decay, sens |
| Format | Pedal | Use | Bass |
| Inputs | Jack | Color | Purple |
| Outputs | Jack | Power supply included | No |
| True bypass | Yes | Power supply | 9V battery, DC 9 V |
| Effect | bass envelope filter | Polarity | center-negative (with AC power supply) |
| Potentiometers | Dry, FX, Decay, Q, Sensitivity (SENS) | Compatible AC adapter | Dunlop ECB003 / ECB003E |
| Footswitch | activation / bypass | AC power supply | no |
| Input | unbalanced 1/4" jack | Manual / user guide | included |
| Output | unbalanced 1/4" jack | Required voltage | 9 V DC |
| Type | true hardwire / true hard bypass | Consumption | 6 mA |
Questions frequently asked
Does the MXR M82 retain the lows of a 5-string bass?
The independent Dry and FX volumes allow boosting the direct signal while controlling the effect. This setup helps preserve the fundamental frequencies in the low registers.
What power supply is required for the MXR M82 pedal?
The pedal requires 9 V DC with a center-negative polarity and a current draw of 6 mA; Dunlop ECB003 and ECB003E adapters are compatible, and a 9 V battery can also be used.
How to adjust the sensitivity and decay of a Bass Envelope Filter?
Sensitivity controls the filter's trigger threshold based on output level and attack. Q affects resonance, producing a more or less vocal attack. Decay determines the sweep closing speed.
What connectors and bypass does this pedal have?
The input and output use 6.35 mm mono jacks. The footswitch provides activation and bypass via a hardwire circuit.
Is the MXR M82 suitable for funk and slap?
For funk, disco, fusion, or slap, this model offers a response triggered by playing dynamics and five controls: Dry, FX, Decay, Q, and Sensitivity.



