Most distortion pedals make a promise they can only half keep. They nail one sound — the one they were designed for — and fall apart the moment you plug in a different guitar or swap amps. The MXR M75 Super Badass Distortion takes a different approach. Instead of chasing a single holy-grail tone, it hands you a 3-band active EQ with ±15dB of range per band and says: shape it yourself. That’s the whole game, and it works.
Released in 2013 as part of MXR’s expanding Badass series, the M75 sits in a lineup that includes the M77 Custom Badass Modified O.D. — an asymmetrical clipping overdrive with its own 100Hz control — and the M78 Custom Badass ’78 Distortion, which leans into vintage-voiced saturation. The M75 is the most versatile of the three: the one that doesn’t care whether you’re playing through a Fender Twin or a Marshall JCM800, running single-coils or humbuckers, playing roots-rock crunch or full-tilt modern metal. With the right EQ settings, it covers all of it, and it does so with the build quality and analog purity that have defined MXR since the company started making stompboxes in 1972.
This is a pedal built on capability, not celebrity association. The spreadsheet of the world’s most-used gear lists it with an honest note: no confirmed primary-source artist connection. What it has instead is a reputation earned one pedalboard at a time by working guitarists who needed something that could actually do what the box claims. That’s a better recommendation than most.
The MXR Legacy Behind the M75
Before examining what the M75 does, it’s worth knowing the shoulders it stands on. MXR built its first distortion pedal — the iconic M104 Distortion+ — in the early 1970s. That simple two-knob unit, running a germanium diode clipping circuit with a single op-amp, became one of the defining voices of late-’70s and early-’80s hard rock. Zakk Wylde ran it through Marshalls to get a core piece of his crushing tone. The riff architecture of early metal was built on the Distortion+, and that lineage runs directly into every MXR gain pedal that followed.
By the 2000s, when Dunlop had fully absorbed the MXR brand, the company started applying modern engineering thinking to the pedal format. More controls, more headroom, more EQ flexibility — without abandoning the 100% analog approach that made the originals compelling in the first place. The Badass series, launched in the early 2010s, represents that evolution: gain pedals designed for players who want more than a fixed voicing, with the build quality to survive the road.
The M75 carries that heritage but adds something the Distortion+ never had: the ability to radically reshape its tonal character mid-signal-chain. At low gain settings it has the warmth and dynamics of a well-cranked vintage amp. At maximum gain it delivers the scooped modern metal tone that contemporary heavy music depends on. The path between those two poles is controlled entirely by the EQ section — and it’s a far wider path than you’d expect from a pedal at this price point.
Controls and Architecture
The M75 ships in MXR’s standard compact enclosure — the same box that’s housed the Phase 90, the Carbon Copy, and dozens of others. Dunlop has thinned the housing slightly on more recent MXR models, the Super Badass included, which shaves some weight without compromising the durability. The top row carries two controls: Output and Distortion. The bottom row carries three: Bass, Mid, and Treble. That’s five knobs on a standard MXR footprint, which requires a slightly more compact layout than older MXR designs, but everything sits within comfortable thumb-reach of each other.
Distortion Control
The Distortion knob is genuinely broad in its sweep. At 8 o’clock — just barely engaged — it produces a mild, asymmetric-tinged crunch that sounds like a slightly overdriven vintage amp. Dial it past noon and the compression increases noticeably; the attack softens and sustain lengthens. At maximum, it delivers a thick, saturated wall of gain with the kind of sustain that lingers at the edge of feedback when you’re running into a loud amp. The control reacts well to picking dynamics throughout its range: backing off your pick attack at moderate settings produces cleaner, more articulate notes, which means you can clean up somewhat through technique alone without reaching for the volume knob. At maximum Distortion, that pickup sensitivity narrows — you’re in fully saturated territory — but the EQ becomes the dynamic tool instead.
Output and Unity Gain
One significant practical note: unity gain on the M75 sits at approximately 10 o’clock on the Output knob. That means there’s a substantial amount of level available above unity — the pedal can push an amp hard for lead boost applications without requiring the Distortion to be cranked. This is useful for the “light gain + high output” approach favored by players who want to hit an amp’s preamp hard rather than saturate at the pedal level. It also means you have headroom to spare for stacking applications.
3-Band Active EQ (±15dB per Band)
This is where the M75 separates itself from the crowd. The ±15dB range on each of Bass, Mid, and Treble is not decorative. At maximum boost, the Bass control can turn a thin single-coil tone into a chest-punching slab of low end. At maximum cut, it can remove virtually all low-frequency content, leaving behind a tight, snappy signal that cleans up beautifully before a high-gain amp. The Treble functions the same way — maximum cut tames the sizzle and white noise that appears at high Distortion settings with single-coil pickups, while maximum boost adds air and bite that cuts through a dense mix. The Mid control is the most nuanced: cutting it produces the characteristic “scooped” metal EQ curve; boosting it pushes the signal toward a more vintage, British-voiced crunch with more presence in the 1-2kHz range.
Premier Guitar’s 2013 review (Matthew Holliman) captured the EQ’s significance accurately: “the highly tweakable EQ is an excellent addition and does much to distinguish the M75 from the distortion hordes.” That assessment holds a decade later. The 3-band EQ is not a trim control — it’s a full tone-shaping tool that changes what the pedal fundamentally sounds like.
Signal Chain Position and Interaction
The M75 performs best in the traditional dirt pedal position: after the guitar and before the amp input. True bypass switching means the pedal is completely removed from the circuit when off — no buffering, no tone coloration in the bypass path. Players with all-true-bypass boards will find it integrates cleanly.
Because the M75’s EQ operates after the gain stage, it shapes the final character of the distorted signal rather than filtering the input. This means EQ adjustments have an additive effect on the distortion texture as well as the frequency balance — cutting bass before the gain structure would reduce low-end harmonic complexity; cutting it at the output EQ stage removes the low-end content while retaining the harmonic saturation. Players who want tighter low end in the actual clipping should consider placing a mild high-pass filter or overdrive before the M75 rather than relying entirely on the Bass cut.
The M75 also stacks well. Its output headroom makes it a strong first stage into a second gain pedal — the wide EQ allows you to pre-shape the signal going into a RAT or a Tube Screamer with precision. Conversely, stacking a clean boost before the M75 (with the M75’s Distortion at moderate settings) lifts the input signal and produces a more harmonically complex, dynamically sensitive distortion character than the M75 achieves alone at the same total gain level.
Famous Players: Honest Assessment
No primary-source Premier Guitar Rig Rundown or confirmed print interview documents a major touring artist using the MXR M75 specifically. This is worth stating clearly rather than inflating a catalog of unverified connections.
The MXR brand has genuine connections to significant artists — Zakk Wylde built his crushing tone partly around MXR units, James Hetfield and classic-era Metallica used the MXR Distortion+ as part of the *Kill ‘Em All* and *Ride the Lightning* attack — but those associations belong to different models, not the M75. Attributing them to this pedal would be inaccurate.
Tyler Bates, composer and touring guitarist with Marilyn Manson on the 2015–2018 tours (co-producing *The Pale Emperor* and *Heaven Upside Down*), appears on Equipboard in connection with the M75 via an Instagram post. However, his November 2019 Premier Guitar interview — which provides a detailed account of his studio and touring rig — lists his main effects as an EarthQuaker Devices Rainbow Machine, Dunlop Cry Baby wah, DigiTech Whammy, Malekko Downer, and Cooper FX Generation Loss. The M75 does not appear in that primary-source gear list. The Equipboard community documentation is treated here as secondary-source only.
The honest story of the M75 is that it’s an artist’s tool, not an endorsement vehicle. It earns its place on boards because the EQ flexibility genuinely solves problems that fixed-voicing distortions cannot. That’s a story that doesn’t require a famous name attached to it.
Specs Table
Tone Recipes and Settings
1. ’70s Low-Gain Rock Crunch (Strat or Tele into Clean Amp)
Distortion at 9 o’clock. Output at 2 o’clock (well above unity). Bass at noon. Mid at 1 o’clock (mild boost). Treble at 11 o’clock (slight cut). This produces a warm, singing crunch with strong pick attack and natural compression. The mild mid boost helps the signal sit in a dense mix. Works extremely well with single-coil pickups into a Fender Twin or Blues Deville running clean.
2. Classic Rock Humbucker Crunch (Les Paul into Marshall)
Distortion at 10–11 o’clock. Output at noon. Bass at 11 o’clock (slight cut). Mid at 12 o’clock. Treble at 12–1 o’clock. The slight bass cut prevents the Les Paul’s natural low-end weight from muddying the crunch. This setting produces late-’70s British rock character — thick chords, defined low end, singing lead tone.
3. Modern Metal High-Gain Scooped (Humbuckers into High-Gain Amp)
Distortion at max. Output at noon. Bass at 1–2 o’clock (boost). Mid at 8–9 o’clock (cut). Treble at 1–2 o’clock (boost). The classic mid-scoop produces the cavernous, percussive attack and wall-of-sound low end associated with modern metal production. The boosted treble maintains pick definition through the scoop. Best with humbuckers; single-coils will feed back sooner at these settings.
4. Tight Metal Boost Into High-Gain Amp Preamp
Distortion at 8–9 o’clock (minimum gain). Output at 3–4 o’clock (maximum). Bass at 10–11 o’clock (cut). Mid at noon. Treble at noon. The M75 hits the amp’s preamp hard with a clean-ish, bass-trimmed signal, tightening the amp’s own distortion and adding note definition. This is the “overdrive a high-gain amp” application — the M75 acts as a gain stage conditioner rather than the primary distortion source. The low-end cut prevents the amp’s preamp from going mushy under the high input level.
5. Lead Presence Boost (Cut Through a Mix)
Distortion at 10 o’clock. Output at 1–2 o’clock. Bass at 10 o’clock (cut). Mid at 1 o’clock (boost). Treble at 2 o’clock (boost). The simultaneous mid and treble boost with bass cut creates a presence-forward, cutting lead tone that projects through a full band without fighting the bass or kick drum for low-end space. The elevated output adds sustain and compression.
6. Single-Coil High-Gain Taming
Distortion at 2–3 o’clock (high gain). Output at noon. Bass at 12 o’clock. Mid at noon. Treble at 9–10 o’clock (significant cut). At high gain, single-coil pickups generate white noise and sizzle that can make the pedal sound harsh. Rolling the Treble back hard addresses this without requiring a noise gate — the signal cleans up and the saturation becomes warmer and more usable. The trade-off is some of the upper harmonic complexity; whether that’s a cost or a benefit depends on the musical context.
7. Always-On Low-Level Drive (Presence Texture)
Distortion at 8 o’clock. Output at 11 o’clock (just below unity). Bass at 12 o’clock. Mid at 1 o’clock. Treble at 12 o’clock. This creates a mild, always-present texture that adds body and harmonic complexity to a clean amp without obviously distorting. The slight mid boost adds warmth and push. Most useful in the context of a clean amp that needs a little more “there” without crossing into crunch territory — the guitar still feels clean but with more presence and dimension.
The settings below use clock positions for all controls: 7 o’clock = fully counterclockwise, 5 o’clock = fully clockwise, 12 o’clock = noon.
How the M75 Fits in the MXR Badass Family
MXR’s Badass lineup groups several complementary gain voices under one nameplate. Understanding where the M75 sits within that family helps clarify when to reach for it versus its siblings:
The M77 Custom Badass Modified O.D. is an asymmetrical clipping overdrive with a focused 100Hz control and a Bump switch. Its character is more dynamic and less compressed than the M75, with no mid-hump, and it excels at low-gain boost applications and blues-rock overdrive. The M75 covers more total gain range and offers a broader EQ toolkit, making it more adaptable but less specialized in the “amp-like overdrive” territory where the M77 is strongest. Dunlop itself recommends running the M77 as a first gain stage into the M78 — the M75 can occupy a similar first-stage role but with less inherent character and more control over the sculpting.
The M78 Custom Badass ’78 Distortion leans into a specific vintage-voiced saturation — tighter, more focused, with a character rooted in late-’70s hard rock. The M75 is more neutral and adjustable by design; the M78 is voiced where the M75 is flexible.
The M249 Super Badass Dynamic O.D. adds a full 3-band EQ to an overdrive circuit rather than a distortion — it covers similar EQ flexibility at lower gain levels. If you want the surgical EQ control but at overdrive intensity rather than distortion territory, the M249 is the appropriate choice.
Comparisons with the Competition
MXR M75 vs. Pro Co RAT 2
The RAT 2 is one of the most used distortion pedals in history, running a LM308 op-amp in a hard-clipping configuration with a single “Filter” control (passive high-frequency roll-off, not a true mid/treble EQ). The RAT’s character is dark, compressed, and aggressive at high gain — it has a specific voice that works brilliantly in certain contexts and poorly in others. The M75 is more tonally neutral and more adaptable: the active 3-band EQ can approximate a wide range of characters the RAT can only hint at with its single filter knob. The RAT wins on character and historical cachet; the M75 wins on flexibility and range. Price-wise, they’re similar in the used market (~$60–90 for an excellent RAT 2, $55–90 for a used M75).
MXR M75 vs. Boss DS-1 Distortion
The DS-1 is the entry-level distortion reference point: three knobs (Level, Tone, Distortion), op-amp hard clipping, a treble-forward voicing, and a price point around $50–60 new. It’s a functional pedal with a specific character that works in certain contexts. The M75 is in a different category entirely: the 3-band EQ, higher build quality, true bypass (versus the DS-1’s buffered bypass), and significantly wider tonal range justify the price difference. If you’re trying to get as much tonal control as possible from a distortion, the M75 wins handily. If you need a reliable, affordable distortion with one well-defined character, the DS-1 does that for less money.
MXR M75 vs. MXR M104 Distortion+
The Distortion+ is simpler by design: two controls, germanium diode clipping, a specific hard-rock voicing that changed the genre in the late 1970s. Players who want that specific character — the singing, compressed, somewhat bright saturation of late-’70s hard rock — belong on the Distortion+. The M75 can approximate that territory with mid boost and moderate gain, but it doesn’t nail the original Distortion+ character precisely. The M104 is a legacy tool; the M75 is a modern workhorse.
MXR M75 vs. Electro-Harmonix Big Muff Pi
The Big Muff is fuzz-forward with a unique midrange scoop built into its tone circuit — its character is fundamentally different from the M75’s harder, more compressed distortion. The M75 can approximate a scooped sound with the Mid control cut, but the two pedals inhabit different sonic spaces. The Big Muff’s warmth and sustain at high settings are qualities the M75 doesn’t quite reach; the M75’s tightness and versatility are qualities the Big Muff cannot approach. They’re complementary rather than competing.
Buying Guide: When the M75 Is and Isn’t the Right Choice
The M75 makes sense for you if: you play across multiple genres or switch between guitar types (single-coils and humbuckers) and need one distortion that adapts rather than two or three pedals for different contexts; you want surgical control over the EQ character of your distortion rather than adjusting your guitar volume and tone knobs to chase the pedal’s fixed voicing; you prefer true bypass; or you’re building a versatile pedalboard that needs to cover significant tonal ground in a single gain slot.
The M75 may not be the right choice if: you know exactly what distortion character you want and that character is narrow (the RAT’s darkness, the DS-1’s bite, the Distortion+’s vintage voice) — in those cases, a purpose-built pedal will serve you better at lower cost; you primarily play at high gain and never need to shape the EQ (in that case, simpler high-gain options exist); or you’re on a very tight budget, in which case the Boss DS-1 delivers functional distortion at a fraction of the price.
Ownership Notes
The M75 is a current-production pedal with wide availability new and used. Dunlop’s build quality on the MXR line is consistent — the enclosure, hardware, and bypass switch have proven reliable across years of production. Power requirements are standard: 9V center-negative, compatible with virtually every multi-output pedalboard power supply on the market. Current draw is not specified in Dunlop’s published specs for the M75, but it is in the low single-digit milliamp range typical for analog gain pedals of this type — any standard 100mA isolated output handles it without issue. The pedal can also run on a 9V battery for battery-powered applications.
One calibration point for new users: because unity gain sits at approximately 10 o’clock, your first instinct may be to set Output to noon and wonder why the pedal sounds so loud. Start at 10 o’clock on Output and adjust from there. The excess headroom above unity is genuinely useful for lead boost applications once you’ve calibrated your baseline.
At high Distortion settings with single-coil pickups, expect some white noise — this is an inherent characteristic of the gain circuit at full saturation. Rolling back the Treble control significantly reduces the noise floor to a manageable level. Players using high-gain settings consistently should consider a noise gate elsewhere in the chain (after the M75, before reverb/delay) if the hiss becomes an issue in quiet passages.
FAQ
What does the MXR M75 Super Badass Distortion sound like?
At low gain settings it produces warm, dynamic overdrive similar to a mildly cranked vintage amp — touch-sensitive with clear pick attack. At high gain it delivers compressed, sustain-heavy modern distortion. The 3-band EQ determines the tonal character across that entire range: neutral settings produce a balanced, punchy distortion; scooped mids produce modern metal territory; boosted mids produce a more vintage, British crunch character.
Is the M75 suitable for metal?
Yes, it covers the full spectrum from moderate rock distortion to high-gain modern metal. The mid-cut capability (cutting the Mid control) produces the scooped EQ characteristic associated with contemporary metal. The high Output level makes it effective for boosting high-gain amp preamps in the “low Distortion, high Output” approach. White noise at maximum gain with single coils can be an issue; humbuckers produce a cleaner high-gain sound.
How does the M75 compare to the MXR M78 Custom Badass ’78 Distortion?
The M78 is voiced specifically for late-’70s and early-’80s hard rock character — it has a particular tonal personality built in. The M75 is more neutral and more flexible: the 3-band EQ gives you explicit control over the tonal character rather than a fixed voicing. If you want a specific vintage voice without much adjustment, the M78; if you want adaptability across many contexts, the M75.
Where does unity gain sit on the Output knob?
Approximately at 10 o’clock — well below noon. There is substantial output headroom above unity, which makes the M75 effective as a volume boost for leads as well as a distortion pedal. Always calibrate your Output level by comparing against the bypassed signal before setting your final level.
Does the M75 have true bypass?
Yes. When bypassed, the pedal is completely removed from the signal path — no buffering, no tone coloration. This makes it compatible with all-true-bypass signal chains and preserves the integrity of high-impedance sources (single-coil pickups especially) when the pedal is off.
Can the M75 work as a boost in front of a high-gain amp?
Yes, and it does this particularly well. Setting the Distortion very low (8–9 o’clock) and the Output high (3–4 o’clock) with a slight bass cut produces a signal that drives a high-gain amp’s preamp hard, tightening the amp’s own distortion and improving note definition without adding significant pedal saturation. This approach works especially well with amp-voiced high-gain amp preamps that respond to input level.
Is there a noise issue at high gain?
At maximum Distortion, especially with single-coil pickups, the M75 produces audible white noise. This is a characteristic of high-gain analog circuits generally, not a defect specific to this pedal. Rolling back the Treble control significantly reduces the noise floor. Players using consistently high gain settings may want a noise gate in the chain after the M75 if the noise becomes a problem in quiet musical passages.
What power supply does the M75 require?
9V center-negative DC, the standard for virtually all modern effects pedals. Compatible with the Dunlop ECB003 adapter, DC Brick, Iso-Brick, and Mini Iso-Brick, as well as any other 9V center-negative supply. It also runs on a standard 9V battery. Current draw is low and falls within the capacity of any standard isolated output on a quality pedalboard power supply.