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Set name: KCompPlus
Features
- The first true advancement in our 2 and 4 knob compressor line. The new features are simple and straight forward
- There is a simple Release Switch that is tuned for single coils or humbuckers. No more wondering if you have the attack or release set right
- Gorgeous sounding Tone Control which emphasizes the most sensitive harmonics that can be lost in compression
- Offers the same gorgeous push of frequencies and sweetening of tone that the old comps gave you, now with the flexibility to easily handle any instrument
Description
Next-Generation Guitar Pedal Effects, Designed and Built in the USA Keeley Electronics started with one man – RK himself – at a kitchen table, and grew through garages, storage units and makeshift workspaces to our modern, cutting-edge facility. We’ve been making and modding effects for nearly a quarter-century, feverishly chasing down tones, pushing boards, amps and earballs to their limits, streamlining our operation and constantly refining our pedals. Robert grew up in a musical family and comes from a long line of electrical engineers. Keeley Electronics started with one man – RK himself – at a kitchen table, and grew through garages, storage units and makeshift workspaces to our modern, cutting-edge facility. We refuse to let creativity and ingenuity be limited – not by profit margins, cheap Chinese manufacturing or by the effects enclosures themselves. That means outsourcing any part of our effects-building operation is out of the question. Everything is made right here in Oklahoma, lovingly assembled by musicians and artists. Visit the Store Visit the Store Visit the Store Visit the Store The new Compressor Plus is for players wanting a smooth, subtle wash from their guitar. Remove just the right amount of peaks for an ambient layer and then blend in the right amount of treble for a nice shimmer to your guitar. Use with your favorite fuzz to create a wall of tone like you’ve only heard on records. Nothing pushes an amp better than the Keeley Compressor Plus.
Brand: Keeley
Style: Pedal
Color: Black
Product Dimensions: 6.75"L x 4.25"W x 3.25"H
Item Weight: 280 Grams
Voltage: 9 Volts (DC)
Amperage: 10 Milliamps
Audio Output Effects: Compression
Controls Type: Knob
Power Source: Battery Powered
Hardware Interface: 1/4-inch Audio
Signal Format: Analog
Style: Pedal
Color: Black
Item Dimensions L x W x H: 6.75"L x 4.25"W x 3.25"H
Item Weight: 280 Grams
Item Dimensions: 6.75 x 4.25 x 3.25 inches
Connector Type: 1/4 inch audio
Brand Name: Keeley
UPC: 854295005703
Global Trade Identification Number: 03
Set Name: KCompPlus
Manufacturer Part Number: KCOMP+
Item Type Name: Compressor Plus Pedal
Unit Count: 1.0 Count
Warranty Description: Two year parts and labor warranty.
Manufacturer: Keeley
Model Name: Keeley Compressor Plus
Model Number: KCompPlus
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Aug 9
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Set name: KCompPlus
Everything works great!
Reviewed in the United States on May 23, 2026 by Derek Dodge
Set name: KCompPlus
Using for bass (Fender Jazz). My biggest takeaway is the clarity and articulation that the Keeley Comp Plus brings, compared to my other compressor (which is the compressor effect on a Boss ME20-B). The articulation of the Comp Plus is amazing! Every note is distinct. Yes, it noticeably evens out the signal; and with no added noise. The downside (and the big question) is low end loss / loss of presence/punch. My sound is definitely tighter, but I found that I had to crank the Level, dial the Blend to 3:00, and start playing with the tone and EQ on other devices to bring back the “thump.” But is it low end loss, is it just less “boomy” and clearer? I dunno. If you’re looking for Jaco Pastorius, or a mids-forward kind of sound you’ll probably love it. And you can definitely cut through the mix with this thing. I’m not 100% sold; going to compare it to Keeley’s Bassist and see where I land. Wherever that is, I don’t think I can do without that clarity, though! EDIT: I went with the Keeley Bassist. Also very transparent, very quiet (although you can introduce noise if you max out the gain). Biggest factor for me, though, was the fact that the Bassist doesn’t steal my low end. I pretty much stay in drop-D tuning, and that low D stays as heavy as ever. Bassist is easy to set up, and doesn’t affect my tone. It’s not cheap, but you can spend way more. And I feel like you get a lot for your money with the Bassist. Recommend!
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Reviewed in the United States on July 1, 2026 by Ben
Set name: KGC2
Yes. My husband loved it.
Reviewed in the United States on July 1, 2026 by Amazon Customer
Set name: KCompPlus
Great guitar pedal. Delivered right on time.
Reviewed in the United States on May 19, 2026 by Jim Wise
Set name: KBass
SUMMARY An excellent, easy to use full frequency range compressor. It passes the low frequencies that most guitar compressor pedals filter out and it's quite transparent. That makes it suitable for bass, keyboards, or any instrument. The only other Keeley compressor that does that is the PRO at $250-$300. The LED design is troublesome and irritating to me. I repeatedly have thought it was on when it was off during gigs and practices. The value isn't great even at the new discounted $169 price when compared to guitar compressors (including keeley). And now they appear to be trying to sell it at $199. At equal price points, I'd recommend the MXR over the Keeley. But both are excellent, just slightly different. The LED thing is annoying as hell on the Keeley, at least to me. -1 star for the LED design. PROS - full frequency range enables use on bass without loss of low end - simple effective knob controls, and mostly intuitive - Red/Green LED indicates when compression is occurring. - 9V power input is located where it should be...on the rear facing panel - Form factor is the "best" size CONS - Red/Green is ALWAYS ON when plugged into power, including when pedal is disengaged. - Blue LED is quite bright, and it indicates whent the pedal is engaged. It's view is obstructed by the center knob in some positions because of the upside down V shape of the knob placement. - Indication pedal is engaged/disengaged is confusing - Value isn't great. It's overpriced for what it is. And now it appears they are raising it higher. DETAILS Red/Green LED ALWAYS ON - This is distracting, confusing and annoying to me. It's just not intuitive. I look down and think the pedal is engaged when it isn't, it just has power to it. Yet there's that damn green light suggesting it's engaged. It makes the pedal less intuitive. The Blue LED is very bright - almost bright enough to make me want to tape over it as some players I've seen have done. Perhaps it can be modded to add a resistor and reduce the current flow to this LED to dim it. A better design would have been to lose the blue LED altogether, and have the red/green turn on when the pedal is engaged, and change color when the compression is occurring. This would be intuitive. And, not burn power on a board that's plugged in and not being used. Or use the Blue LED to indicated there is power applyied, green for "on" and red for "compressing". Because of the "always on" LED I have to unplug my pedalboard when not in use, or unplug this pedal's power. It's ok, but a little annoying. The value at $200 MSRP is poor, at $169 is still overpriced, and should cost the same as a Keeley Plus guitar compressor which is $129, in my opinion. They priced it to compete with the "defacto standard" MXR Bass Compressor at $200 which is also VERY overpriced for what it is. I bought it at $169, mostly because it was $30 cheapers and I expected it would work well. In my opinion, this is just gouging bass players, who do need the full range of frequencies to pass through (which means they need LESS frequency filtering circuit components, hence should cost manufacturer less to build it.) Overall I reduced 1 star for the value and the LED design. But I like the product, I bought it and I'll probably keep it. Someone needs to bring out a cost effective full frequency range compressor for bass (and other non-guitar instruments). COMPETITIVE COMPARISON First, if you think you're just going to use your guitar compressor pedal with your bass, think again. It's going to chop the low frequencies off and you don't want that when playing bass. The only guitar compressor I thought came close was a Truetone Route 66 pedal that has a bass boost switch, that brought some of that low end back (and the overdrive sounded great too). But even that paled when put side by side with the bass compressors which just had more low end girth. The MXR bass compressor is the top competitor. I bought one on sale for $174, mostly because the LED's of the Keeley were really annoying me. The MXR does a much better job of indicating it is engaged, as well as showing how much compression is occurring. The LEDs are more visible and the knobs don’t get in the way of that because their layout leaves room around the LED's for good line of sight in any position. I really prefer the MXR on those points. But I found its control settings less intuitive in part because it has two controls (attack/release) and a 4-choice compression ratio plus input and output levels. I had to go read the manual to really understand how to set it initially. By comparison, the Keeley has a sweepable compression ratio knob (vs 4 fixed options), then a threshold and a level. I dialed up an acceptable sound rapidly and intuitively on the Keeley but struggled to find it on the MXR until I read the manual. After a few sessions of comparison, I decided I liked the sound of the Keeley slightly better, as the MXR has a little bit softer, duller sort of compression sound. Even with the attack turned to full, I felt like the attack lost it's "cut". I also liked a compression ratio that falls in between the preset options offered on the MXR. (about 6:1, vs 4:1 or 8:1) I was truly torn on which compressor to keep. I hate the LEDs on the Keeley and I keep thinking it is on and engaged when it’s not despite being fully aware of that issue. It even happened to me in practice on the same day I initially wrote this review...when it's functionality was most fresh in my mind. But it sounds good and it is intuitive to set. The MXR is also very good, but I wish the compression ratio was continuously adjustable vs 4 set points, and the soft edge on the compression was just a little less preferable for my use. In the end, I returned the MXR even though I really wanted to keep it as nearly everything else on my bass board is MXR. I had to acknowlege my cost was sunk on the Keeley (meaning I'd have had to sell it used at some level of loss) but I could still return the MXR for a refund. Plus the MXR even on sale was $5 more, but most importantly, I preferred the overall sound of the Keeley and the ease of dialing it in. At the same price point, I'd still recommend the MXR. In my instance, I kept the Keeley, but I might regret that down the road. If I didn't already own the Keeley, I probably would have kept the MXR and adjusted for a bit more brightness at my preamp. They are both really nice bass compressors. But man I wish the Keeley didn't have the weird LED design. It drives me nuts.
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Reviewed in the United States on May 31, 2024 by Johnny Guitar
Set name: KCompPlus
Keeley's compressor pedals have been an industry favorite for many years, and the Compressor Plus is a compact and relatively affordable example of why. Keeley certainly didn't "invent" the compressor, and I've used pedals like the BOSS CS-3, MXR Dyna Comp, and Ross Compressor that have done the job well for several decades. However, this particular pedal from Keeley merges the best attributes of all of those pedals into a single, easy-to-use box. I find that the BLEND control is a important addition that you see in more and more compressors nowadays. (Wampler's excellent Ego Compressor also features this control). Basically, it's a "mix" control so that you blend in and amount of dry signal along with the compressed signal. This is important because in many cases, you want the note sustain and volume limiting qualities of a compressor, but don't want to lose that initial "punch" of the note. The BLEND knob allows you to adjust for both, and there's a toggle switch that further adjusts for the difference in attack between single-coil and humbucker pickups. (Coincidentally, my Reverend guitar features P-90's and I found that those worked better on the humbucker setting, despite them being technically a variant of a single coil pickup). The Compressor Plus is capable of adding tons of rich sustain, similar to that first time I plugged into a BOSS CS-3 and was amazed that an electric guitar could sound like that! It also can do the "chicken picking", "squished" type of compression prevalent in country or other music with quick, clean note passes. Thanks to the interplay between BLEND, LEVEL, and SUSTAIN, it's possible to also make it quite transparent for a more subtle effect. A few notes/caveats... The TONE knob works well, but it is not really meant to be an "EQ shaper" for your overall tone. It is more subtle than that, and basically just enhances or subdues the upper end dynamics through compression. Also, this pedal (as with many compressors) is susceptible to noise issues if you have problems with your power supply. I initially plugged it in with a separate power supply than my pedalboard. I must have been getting some type of ground loop or something because it resulted in terrible noise to the point of being virtually unusable. However, when I attached it to my board and used the same isolated power supply as the other pedals (Voodoo Labs Pedal Power Mini x4), the noise was almost completely gone. Just something to be aware of if you encounter that issue.
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Reviewed in the United States on February 15, 2024 by StormJH1
Set name: KCompPlus
Pedal seems to be exact what I need. Not knowledgeable enough to elaborate too much, though BUT, (First to admit, I don't know beans about electrical specs, so I may oblivious to something critical) I bought a D'Addario power adapter to power this unit, and I noticed after a few days a persistent whine at about 2.4Khz. I hadn't noticed it at first b/c when recording, I chop off the quiet part the beginning and end, but it became apparent quickly enough. I swapped it for another adapter I had, and that one gave me a VERY loud hum. Figuring that I was probably returning this compressoer, I tried a third adapter, a cheapy purchased from Amazon, brand name WUKUR, and it works perfectly. Not dead silent, but 95% of the way there. I put the D'Addario on a tuner, where it works as it should. Did not realize that different adapters can introduce signal issues with pedals. Lesson learned. If you have problems with your pedal being noisy, start with the power adapter.
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Reviewed in the United States on June 27, 2026 by Jenny M. Stebbins
Set name: KCompPlus
It was excellent. I mistakenly thought it was defective then later discovered the power brick on my pedalboard was defective and was the source of the problem. This pedal was extremely easy to use and had an excellent compression effect, easier to dial in than the MXR pedal that I bought to replace it.
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Reviewed in the United States on June 9, 2025 by Nelson