Keeley Compressor Mini

The Keeley Compressor Mini is a small, two-knob compressor pedal from Keeley Electronics, launched on 15 September 2021¹. It is an all-analog stomper in a compact, pedalboard-friendly enclosure, and it is designed to be about as simple as a compressor gets: one knob for level, one for compression, and nothing else².

What sets it apart from most two-knob compressors is the circuit. Delicious Audio reports it is not a rehash of an old design but a brand new circuit delivering what mixing engineers call "Manhattan-style compression", also known as parallel compression³. MusicRadar describes the result as a form of parallel compression that tightens up your sound without squashing all of its dynamics⁴. In practice that means the pedal mixes compressed and clean signals for a more natural, dynamic-sounding tone³.

What it does: parallel compression in a mini pedal

Parallel compression is the trick of running a heavily compressed signal alongside the untouched clean signal, so you get the sustain and evenness of compression while keeping the attack and dynamics of your playing. On most pedals you do this yourself with a blend knob. On the Mini, since there are only Level and Comp knobs, the blending of the two signals happens automatically depending on the position of the Comp control³.

The Mini also carries a preamp. Pedal of the Day describes it as a built-in preamp for what the site calls incredible guitar tone, and quotes the pedal's preamp tone as "legendary; pushing both pedals and amplifiers to their greatest potential"⁶. MusicRadar notes that with the onboard preamp, the Level control can push the pedals in front of it and your guitar amp, or alternatively be set at unity gain⁵.

The controls: Level and Comp

There are controls for Level and Compression, and that is that⁴. Robert Keeley had been working on a tweaked, simplified version of his compressor circuit designed to make it as easy as possible to use¹.

Premier Guitar's review characterizes the two knobs as output level and compression threshold, noting that the attack, release and ratio are left up to the circuit itself⁷. For players used to four-knob compressors, that is the trade: fewer decisions, faster setup. Pedal of the Day found that with just the Level and Comp knobs, a great sound is easy to dial up in literally a minute, and that the range of tones is still extremely present⁶.

One useful reference point: Premier Guitar found that unity gain generally occurs at around 30 to 40 percent of the Level knob's range⁷. The same review found that most settings north of noon lend a fat but tasteful bump in the low-mid zone that makes the preamp sound extra sweet with humbuckers⁷.

History and versions: from the Keeley Compressor to the No420 edition

The Mini sits at the end of a long line. Robert Keeley built his original Keeley Compressor in 2001, based on R. G. Keen's schematic, and it went through two-knob and four-knob versions over the years⁸. The two-knob original was discontinued at the end of 2014 in favor of the updated four-knob version with input trim and attack knobs on the outside of the enclosure⁸. The Keeley Compressor Plus, released in 2017, added a clean blend and converted Attack to a switch⁹.

The Mini is in some ways a step back toward the beginning. As Premier Guitar put it⁷:

The Mini launched in two finishes: Standard Black Neon and a limited-edition Arctic White, the latter restricted to the first 1,000 units⁴. Guitar World reported the Arctic White as a limited-edition run of only 1,000 units, with both versions priced at $129¹⁰⁴. The electronics sit in an eye-popping case bearing colorful retro-flavored stripes².

In April 2023, Keeley followed up with the No420 Custom Shop edition, a special Custom Shop version of the Compressor Mini refinished in orange, with an illustration of a guitar effects mini-pedal smoking what looks like a non-regulation cigarette⁵. It was priced at $129, the same as the standard pedal, and the first batch sold out, with a restock shipping on or before 2 May 2023⁵.

What reviewers said

Reception was positive across the press:

• Gearnews found the demo video quite impressive and liked the price point, calling it reasonable for a quality compressor pedal¹.
• Pedal of the Day highlighted the increased sustain range for even more subtle compression, and praised how quickly a great sound can be dialed up⁶.
• Premier Guitar concluded that if small size and the joy of setting and forgetting are priorities, the Compressor Mini is a value that is tough to beat⁷.

Questions