Guitar Pedals · owner-verdict comparison

Keeley Compressor Plus vs MXR Carbon Copy: what real owners say

Real owners lean toward the MXR Carbon Copy: 71% of 31 owners recommend it, vs 61% of 69 for the Keeley Compressor Plus.

Verdicts aggregated from Reddit, enthusiast forums, and YouTube owner comments — affiliate reviews excluded. Sample sizes differ; judge accordingly. How we score

Keeley Compressor Plus

61%of 69 owners recommend
61% recommend · 13% neutral · 26% don't
Owners praise
  • Blend knob keeps pick dynamics intact while still compressing, and makes subtle settings easy
  • Single-coil/humbucker switch handles guitar swaps without re-dialing anything
  • Smooth, largely uncolored compression that owners leave always-on
Owners complain about
  • Audible hiss and broadband noise, by far the most common owner complaint
  • The noise scales with the sustain knob, so the usable sustain range is narrower than the knob suggests
  • Buzz is worst with single-coil guitars, where several owners called it unusable
Full owner report →

MXR Carbon Copy

71%of 31 owners recommend
71% recommend · 13% neutral · 16% don't
Owners praise
  • Warm, natural-sounding analog delay tone that owners rank among the best analog delays available
  • Long-term reliability and loyalty, owners keep it for a decade or more, tour heavily with it, and keep returning to it after trying other delays
  • Underwhelming compared to alternatives for a minority of owners, some felt it didn't outperform other delays (like the analog settings on an FB/FB4) and ended up returning or replacing it
Owners complain about
  • Underwhelming compared to alternatives for a minority of owners, some felt it didn't outperform other delays (like the analog settings on an FB/FB4) and ended up returning or replacing it
Full owner report →

Which should you buy?

Get the Keeley Compressor Plus if
  • ✓Players switching between single-coil and humbucker guitars on the same board
  • ✓Anyone who wants an always-on compressor that can be dialed back with a blend control
  • ✓Buyers stepping up to a first serious compressor who want simple controls
  • ✓Players who also need a clean or lead boost from the same enclosure
Skip it if
  • Quiet clean playing or recording, where a raised noise floor is hard to ignore
  • Single-coil players who are sensitive to buzz and hiss
Get the MXR Carbon Copy if
  • ✓Players wanting warm, natural analog delay
  • ✓Guitarists after slapback and short echo settings
  • ✓Ambient players needing swells that preserve the dry signal
  • ✓Beginners who want simple, hands-on controls
Skip it if
  • Players needing versatility beyond one analog sound
  • Those wanting very long delay times

What Keeley Compressor Plus owners say

“The Keeley compressor has been on my board for a long time and it works well for me. I switch guitars between a tele and a es-135, so the simple single coil/humbucker toggle switch is a very useful feature.”
— Sensitive-Muscle2606 on Reddit
“I'll say the only reason I left the Keeley for the Wampler was because the Wampler comes in mini... Both are great. Love the pickup switch on the Keeley too”
— chancesteward on Reddit
“My compressor Plus buzzes like crazy with my single coil guitar and it drives me nuts. I find if you turn down the sustain knob it helps, but having extra sustain is kinda the point.”
— MedicineforMadness on Reddit

What MXR Carbon Copy owners say

“Easily my favourite delay pedal!”
— @thejosebatista on YouTube
“Love the CarbonCopy.”
— @northof50now on YouTube
“j'ai acheté cet effet c'est loin d'être ça !”
— @francoisb4830 on YouTube

Keeley Compressor Plus vs MXR Carbon Copy: frequently asked questions

Is the Keeley Compressor Plus or the MXR Carbon Copy better?

Real owners lean toward the MXR Carbon Copy: 71% of 31 owners recommend it, vs 61% of 69 for the Keeley Compressor Plus.

Who should get the Keeley Compressor Plus?

Owners point the Keeley Compressor Plus at players switching between single-coil and humbucker guitars on the same board, and anyone who wants an always-on compressor that can be dialed back with a blend control.

Who should get the MXR Carbon Copy?

Owners point the MXR Carbon Copy at players wanting warm, natural analog delay, and guitarists after slapback and short echo settings.

What do owners complain about?

The most-cited downside of the Keeley Compressor Plus is audible hiss and broadband noise, by far the most common owner complaint. For the MXR Carbon Copy, it's underwhelming compared to alternatives for a minority of owners, some felt it didn't outperform other delays (like the analog settings on an FB/FB4) and ended up returning or replacing it.