Image: Roadside Guitars, CC BY-SA 2.0 — via Wikimedia Commons
MXR Dyna Comp
| Category | Electronic (effects pedal — compressor) |
|---|---|
| Country of origin | USA |
| Classification | effects pedal |
| Wikipedia | en.wikipedia.org |
| Wikidata | Q4027480 |
Overview
The MXR Dyna Comp is a compact guitar compressor effects pedal first introduced by MXR Innovations in the early 1970s. Its two-knob layout — Output and Sensitivity — makes it one of the simplest pedals to operate and one of the most recognisable. It is prized for the quick, fairly aggressive compression that produces the snappy, “squashed” clean tone associated with country, funk, and pop guitar.
Origin & History
MXR Innovations was founded in Rochester, New York in 1972 by Keith Barr and Terry Sherwood. The Dyna Comp appeared early in the company’s catalogue and became one of its longest-running products. The original circuit was built around the CA3080 operational transconductance amplifier; later production runs used different chips, and reissues by Jim Dunlop have continued to refine the design while preserving the recognisable feel.
How It’s Played
The pedal is placed early in the signal chain, before drive pedals, and its Sensitivity control sets how aggressively the circuit clamps the loudest peaks. Players use it to even out fingerpicking dynamics, to add sustain to single-note lines, and to give a percussive “pop” to chicken-picked country and funk parts. Its characteristic colouration on the attack of each note is part of the appeal.
Cultural Significance
The Dyna Comp is one of the founding products of the modern compact-effects-pedal market and a staple of pedalboards worldwide. Country session players in Nashville, funk rhythm guitarists, and many touring pop guitarists have used it for decades. The pedal’s circuit has been studied and cloned extensively in the boutique pedal scene.
Related Instruments
- Octavia – classic boutique effects pedal
- Dallas Rangemaster Treble Booster – British boost contemporary
- Roland RE-201 – sibling-era effects unit
- DigiTech Whammy – modern digital effect contrast
- Empirical Labs Distressor – studio-grade compressor relative
Frequently Asked Questions
Where in the signal chain should the Dyna Comp go?
Most players place it first or very early in the chain, before drive pedals.
What chip does the original use?
The CA3080 operational transconductance amplifier; later runs and reissues have used different ICs.
Is the Dyna Comp still made?
Yes — Jim Dunlop manufactures the current MXR-branded production version.
Image credit: photograph by Roadside Guitars (CC BY-SA 2.0).