Description
MXR built the M85 Bass Distortion with input from Ryan Ratajski of Fuzzrocious Pedals, a name synonymous with filthy, characterful bass grit. That pedigree shows up in how this stompbox handles low frequencies: rather than smearing your tone into mush, it keeps the fundamental note front and center, so your signal stays articulate and punchy even when you’re pushing the gain hard and running little to no dry blend.
The heart of the M85’s flexibility is a clipping selector switch that lets you choose between silicone diode and LED clipping modes. Flip to silicone diodes for a more aggressive, compressed crunch that’s great for cutting through a dense mix, or switch to LED clipping for a looser, more open distortion character that retains dynamics and touch sensitivity. Either way, you’re getting genuine low-end aggression built specifically for bass, not a guitar pedal pressed into service.
A dedicated high-cut tone control rounds out the feature set, giving you a way to rein in fizzy top end that can creep in with heavier distortion settings. Dial it back for a smoother, rounder growl, or open it up when you want extra bite and presence in the mix.
- Silicone diode / LED clipping selector for two distinct distortion voicings
- Preserves fundamental note clarity even at high gain
- High-cut tone control to manage top-end harshness
- Compact stompbox format built for pedalboard duty
Whether you’re chasing a snarling, in-your-face growl or a more refined, open drive, the M85 gives bass players a purpose-built distortion tool that holds its low end together under pressure.









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