Description
The M78 is MXR’s hot-rodded take on a classic distortion circuit, built to sound less like a pedal and more like a cranked amp stack pushed into old-school tube saturation. Drop it in front of a clean, edge-of-breakup, or already-dirty amp and it layers on huge, wide-open gain that still lets your playing dynamics through — great for soaring lead lines as well as thick, saturated rhythm tones.
Controls are kept simple: three knobs handle the core tone-shaping, while the CRUNCH switch is where the real character lives. It toggles between two clipping modes — diode and LED — reshaping the harmonic content of the distortion so you can move from a tighter, more aggressive edge to a rounder, more amp-like crunch without touching your amp settings. True hardwire bypass keeps your signal clean and unaffected when the pedal is off, making it an easy drop-in for any board.
Under the hood it’s built with road-ready circuitry and hardware for long-term reliability, and the specs back up the tone: a wide 27dB distortion range at 500Hz, tilt EQ shaping at both 100Hz and 2kHz, and low current draw (2.5mA with LEDs off, 6mA with LEDs on) that’s friendly to isolated power supplies.
- Hot-rodded classic distortion circuit with amp-stack-style saturation
- CRUNCH switch selects diode or LED clipping for two distinct harmonic voices
- Works well ahead of clean, dirty, or fully overdriven amps
- True hardwire bypass, standard 9V DC operation
- Includes two 6-inch patch cables for pedalboard hookup
Specs: Input Impedance 1MΩ, Output Impedance 6kΩ, Normal Input Level -22dB, Max Output (Crunch Off) -5dBV, Max Output (Crunch On) -2dBV, Noise Floor -84dBV, Distortion Range 27dB at 500Hz, Max System Gain 43dB, Tilt EQ ±4dB at 100Hz / ±5dB at 2kHz, Current Draw 2.5mA (LEDs off) / 6mA (LEDs on).
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