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  Home > AnalogMan Pedals & Modified Effects > Compressor Pedals >

Analog Man Large CompROSSor Compressor pedal
Analog Man 3 Knob Large Comprossor
3 Knob Large Comprossor


Our Price: $215.00

Availability - time to dispatch:: Usually Ships in 1 to 2 Business Days


Comp Version*:
REV5 with Mix Trimpot on board- We can put the MIX control on the circuit board, so you can set and forget it. Turn it down all the way for no dry sound blended in, like our older versions and Dynacomp, Ross, etc. Turn it up all the way for no compression, just a great clean boost/buffer pedal. Best set somewhere in the middle where you get just enough of the DRY signal to have the normal guitar feel.
REV5 with external MIX knob, in Attack location (attack moved to internal trimpot)- on the old 4 knob case, we can put the ATTACK control (which is rarely adjusted) inside the pedal on a trimpot. Then we can put the MIX knob where the ATTACK knob normally goes. We may use a sticker over ATTACK or ATK and label it MIX.
Old REV3 version- This version is the original Dynacomp/Ross circuit, no MIX control, with poor output impedance and not very loud output. But the poor buffering when ON might work in some setups, like running comp into a vintage fuzz.
REV5 with external MIX knob add $25 [Add $25.00]- We can add a MIX knob, with center detent at 12:00 at the 50% mix point. Turn it up all the way for normal compressor sounds (no dry uncompressed sound). Turn it down all the way for no compressed sound, just a nice clean boost/buffer that makes pedals after it sound better.

Add a Toggle Switch:
Add RYCK toggle option $40 [Add $40.00]- Will not fit on Mini Bicomp with both ATK and MIX knobs.

Jack Location*:

Add a Patch Cord:
12" switchcraft soldered pancake type patch cord $18 [Add $18.00]

Add a Patch Cord:
6" switchcraft soldered pancake type patch cord $15 [Add $15.00]
Guitar cables

Add a CBI Ultimate 15 foot Guitar Cable $25 [Add $25.00]Add a great sounding 15 foot long guitar cable, black with straight metal soldered Neutrik ends.
Power Cables for your existing multi-power supply

18" Power Cable for PP2 (one straight and one 90 degree end, unless you specify in comments) $3.50 [Add $3.50]Does not work with our $15 Boss type power supplies, has 2 male ends for use with Voodoo Labs etc

Extra 36" power Cable for PP2 with one 90 degree end $4.50 [Add $4.50]Does not work with our $15 Boss style power supplies, has 2 male ends for use with Voodoo Labs etc
Optional power supplies

Add a Power Supply:
US 120V 12vDC $18 [Add $18.00]- This USA power supply will give 12V to the pedal instead of 9V, see the pedal description for more info on why you might like this.

Add a Power Supply:
US 120V 9vDC $15 [Add $15.00]- This is a normal 9V Boss type external power supply/adaptor for USA use with 120V AC wall power.

Add a Power Supply:
Euro 240V $15 [Add $15.00]- this is an external power supply/adaptor for use with 220/240V AC to make 9Vdc for the pedal.

Add a Power Supply:
UK 240V $15 [Add $15.00]- this is an external power supply/adapter for use with UK (3 prong) 220/240V AC to make 9Vdc for the pedal.

Add a knob cover:
Add an MXR style knob cover $1.99 [Add $1.99]- This knob cover fits on the larger of the two versions of MXR style knobs we use on our AM pedals. They make it easy to turn the knob with your foot. If you want more than one, you can add them to your shopping cart from the Accessories - Pedal Parts menu.

NOS 1978 RCA Compressor chip $10 [Add $10.00]We always use New Old Stock (NOS) CA3080E chips in our comps, I don't think any other well-known brands are still using them. They were made by RCA, then Harris and Intersil as the company was renamed over the years. We have some original 1978 RCA CA3080E chips that I have been saving for years, so I am putting them up as an option. I don't think they sound much different, but they are the exact same ones used in the old grey Ross compressors so it's pretty cool to have one in your pedal.

Analog Man offers the 3 or 4 Knob Large Comprossor. An improved, updated ROSS compressor with hand tested, selected transistors and NOS CA3080E chip. Also includes the ATTACK knob, true bypass, LED, and power jack. An amazing pedal!!

REV5 version with MIX control available in 2016!


  1. 100% ross specs with hand tested, selected transistors and NOS CA3080E chip.
  2. External attack knob on large comprossor starting in 4/05
  3. Optional external attack knob on small comprossor 5/03
  4. MIX control available as trimpot or external knob. Turn it down all the way for no dry sound blended in, like our older versions and Dynacomp, Ross, etc. Turn it up all the way for no compression, just a great clean boost/buffer pedal. Best set somewhere in the middle where you get just enough of the DRY signal to have the normal guitar feel.
  5. Attack knob has a detent at 12:00 which is the standard Ross/ Dynacomp attack setting.
  6. True Bypass with 3PDT switch
  7. LED with metal bezel
  8. Power jack standard, no extra charge. You can plug a Boss style 2.1mm x 5.5mm barrel 9V DC adaptor into this jack.
  9. UK made RE'AN jacks for best noise isolation and operation. They are more expensive than the metal Mexican Switchcraft jacks that others use, but the benefits outweigh the cost.
  10. Expensive high quality Matsushita/Panasonic capacitors.
  11. Easily repaired if damaged- no custom parts like a mass-produced pedal.
  12. Built in a grey hammer-finish powdercoated box (4" x 5" x 2.25") as seen at the right, with silkscreened graphics, or optionally in the smaller box (2.5" x 4.75" x 1.5" not including jacks, switch, etc) as seen below with hand stamped graphics.

Rev4 circuit

In April, 2013 we really improved the COMPROSSOR circuit. Mike had been playing in a band for a few years, and noticed that SOME pedals on his board would not drive a load well, they would get dark and dull, due to a bad (high) output impedance. This is easily tested by running pedals into something like a low impedance volume pedal, with a switchable buffer between them. The ARDX20 with the delay level down is excellent for testing - when ON it's a great buffer, when OFF it's true bypassed. To test a pedal, simply turn the buffer on and off and listen for a change in tone. With most pedals, like our Chorus, Juicer, etc, there is no difference - they can drive the signal to your amp through long cables or volume pedals no problem. But the Comprossor sounded dull when the buffer was removed. The original Ross, Dynacomp, and all the other Ross clones do the same exact thing- they really need a buffer after them to sound good.

Also these pedals don't have a very loud output, especially when you hit them hard, for example with humbuckers or a boosted signal. One other problem all these pedals have is phase reversal - they flip the phase of your signal when you turn them ON. This may not be a problem for most people, but if you split your signal and combine it, or run into two amps, the out of phase signals will cancel and you will get a VERY thin sound. Also, for use as a clean boost, there was too much compression even with the SUSTAIN pot all the way down. So we reduced the minimum compression amount, without changing the maximum amount. Now the pedal is more usable as a clean boost, and also sounds great left on all the time as a tone sweetener/buffer. It's great stacked into dirt pedals, chorus, vibes, etc now. With these problems fixed, there is no need for a blend knob, you should be able to keep your pure tone without the need for additional circuitry. One other thing we improved was the LED circuitry. Now, if one side of the bicomp/mini bicomp is ON, and you turn the other side ON, the first LED does not get dimmer. A small change but something that bothered us. The REV4 boards are usually blue as seen in this picture of the BICOMP.

All of these problems are fixed in the REV4 circuit -

  1. Excellent output impedance for a clearer tone with no signal loss or need for a buffer
  2. More available output for boosting your amp
  3. No phase reversal
  4. Less compression available

Rev5 circuit

This is pretty much the same as REV4 with the addition of a MIX control, which can go from full dry (no compression) to full wet (same as REV4). Mixing in dry gives you the normal attack of the note, which can be compressed away, if you want to hear that. When set at full dry, the pedal becomes a clean boost/buffer pedal and makes pedals after it sound really great, with more presence. Mix is available as a trimpot on the circuit board or as a fourth external knob.

Ryck toggle option

The Dynacomp and Ross circuit is not very bright, to keep white noise down. But sometimes it's nice to have a bright trebly tone, as heard on Rickenbacker guitar's built-in compressor. Looking at the Rickenbacher schematic, it's about the same as the Dyna/Ross except it allows more treble for that jingle-jangle sound. We decided to offer this with a three-way switch so you can get just the amount of treble you want. One position is the normal Dynacomp/Ross value for about the same tone as OFF and low noise. The second position adds a bit more treble and just a touch of noise - this may be great to use all the time with a dark guitar like a Les Paul with high output pickups. The third position is twice as bright, close to the Rickenbacker setting, for a sound that really pops, with a bit of noise that you won't notice till you stop playing. We can put this toggle on any of our new CompROSSor or Dynacomp pedals when ordered, or we can add it later on which costs a bit more as it's more work to add it after the pedal is built.

For more detailed info, see the compressor page on

Here is a good article on the REV4 comp from Tone Quest Report : Tone Quest 2013 article

Average Customer Review: 5 of 5 Total Reviews: 3 Write a review.

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  4 of 6 people found the following review helpful:
the Best Compressor on the Planet June 19, 2014
Reviewer: Rakesh Rai from Singapore, Asia Singapore  
I have tried BOSS, IBANEZ, ROCKTRON, DOD, ZOOM, etc. but nothing beats this Monster Comprossor. Thick round tone, yet super clean, more like a recorded studio sound. It is amazing how AnalogMan came up with this type of unique compressor tone. It's priceless circuitry does not burn a hole in your pockets. Excellent for pedalboard placement right before your distortions/overdrives.

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  0 of 0 people found the following review helpful:
Great Tone + Versatile + Quiet = AWESOME May 15, 2014
Reviewer: teletwang from Alpharetta, GA, USA  
The tone produced by the pedal is outstanding and the ability to change the attack and release means you don't have to settle for the stock Ross "Nashville squash".

As is the case with all AM pedals, it is dead quiet, a feature that sets it apart from your standard, mass-produced stuff.

If you're wondering whether you want the Ryck option, you do.  Even if you don't play "darker" guitars.  The Ryck option sounds great on my Strat and on my Tele, especially in combinations that use the neck pickup.

If you're looking for a compressor that just smooths out the rough edges, without squashing your tone - a la traditional Ross/MXR pedal - this is what you're looking for.

Highly recommended.

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  0 of 0 people found the following review helpful:
Impressed with Comprossor February 2, 2014
Reviewer: Greg from USA  
My children purchased the large box Comprossor with three way toggle for me as a Christmas gift at my request. I had read about it in my Tonequest Report and for some reason decided I wanted to have one, although being mostly a basement player I am trying to refrain from purchasing more "stuff."

I tried it out late Christmas morning and within a half an hour or so dubbed it the "Magic Pedal." The tones I enjoyed were unbelievable given the fact that I was using the same guitars and amp that I had always been using. Since that time I have been using it with my other guitars and amps, and cannot believe what it does for my overall tone. As a clean boost it bridges that little gap between the guitar volume on 10 and an overdrive pedal. With overdriven tone it adds different nuances. And when I use it with my boost pedal... I could go on and on. I spoke with David Wilson at Tonequest this afternoon about an unrelated issue and just mentioned my pedal and how satisfying it has been. He suggested I let YOU know how I am enjoying it. I just assumed that you know you make a great product. And if you didn't I'm telling you now. It's unbelievable to me that every "tonehound" doesn't own a GOOD compressor.

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