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Keith Barr and Terry Sherwood started out repairing audio gear from a basement apartment in Rochester, New York, and by 1972 had turned that into MXR, one of the pedal companies that shaped what a "stompbox" was meant to be. The Phase 90, Dyna Comp and Distortion + all came out of that first decade and are still in production today, largely unchanged in circuit even as the enclosures have been refreshed. MXR stopped production in 1984 and was bought by Jim Dunlop in 1987, who has run it since as a line of reissues and new pedals, including signature editions for players like Eddie Van Halen and Zakk Wylde. We cover MXR mostly through its history and its place in classic pedal-effect guides. Here's what we've written.

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DealsBy Jef Stone
Founded1972
Based inRochester, New York, USA
FounderKeith Barr and Terry Sherwood
Parent companyDunlop Manufacturing
Articles here24
Makes
  • Effects pedals
Known for
  • Phase 90
  • Dyna Comp
  • Distortion+
  • Carbon Copy
  • Micro Amp

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MXR FAQ4 questions

Who owns MXR?

Jim Dunlop. MXR was co-founded in Rochester, New York in 1972 by Keith Barr and Terry Sherwood and incorporated as MXR Innovations in 1974; the trademark is now owned by Dunlop Manufacturing, which builds the current range alongside Cry Baby and Way Huge.

What is the MXR Phase 90?

A four-stage phaser in a small orange box, and one of the most recognisable effects pedals ever made. It has a single Speed control and nothing else, which is part of the appeal — the association with Eddie Van Halen's early sound made it a standard rather than a period effect.

What does the MXR Dyna Comp do?

It is a compressor built around an OTA chip, known for a distinctly audible squash and a bump in sustain rather than transparent level control. It is used deliberately as a sound in country and funk playing, not as a studio-style utility compressor.

What is the difference between the Carbon Copy and the Carbon Copy Deluxe?

Both are analogue bucket-brigade delays with the characteristic dark repeats, but the Deluxe extends the maximum delay time and adds tap tempo and more modulation control. The original stays smaller and simpler, which is why it still sells alongside the bigger version.