The Carl Martin HeadRoom Mini Stereo Reverb is a compact stereo reverb pedal and a smaller companion to the original Carl Martin HeadRoom, which Delicious Audio's Paolo De Gregorio called "the modern version of a classic real spring reverb that won many hearts a couple of decades ago"1. The Mini is built around two channels, each with its own Reverb (amount), Tone and Decay controls, and a Select footswitch that switches between the two channels instantly1.
Two channels, one footswitch
The HeadRoom Mini's main feature is its pair of independent channels. Each channel carries its own control set, so two different reverbs can be dialed in at once, and you switch between them instantly via the Select footswitch1. Delicious Audio gives the example of setting a bright room sound on one channel and a different space on the other1.
| Control | What it does |
|---|---|
| Reverb | Sets the reverb amount for the selected channel1 |
| Tone | Shapes the reverb tone, per channel2 |
| Decay | Sets the reverb decay length, per channel1 |
| Select footswitch | Switches instantly between the two channels1 |
Carl Martin's own product page for the HeadRoom line lists separate Tone A and Tone B controls, adjusting the reverb tone for channel A and channel B respectively2.
Stereo in, stereo out
The Mini has mono and stereo inputs and outputs, and De Gregorio writes that "it adapts to both standard setups and immersive stereo rigs"1. A player running a single amp can use it mono; a player with a stereo rig can place it at the end of the board for a wide reverb image. The rugged metal casing also includes a remote switch jack, letting the channel switching be controlled from elsewhere on a board1.
Bypass and the original compared
The two HeadRoom versions differ on bypass. Delicious Audio lists the Mini as buffered bypass, "ensur[ing] signal integrity even in long pedal chains"1. Pete Thorn's 2011 demo of the original HeadRoom described that pedal as having "true bypass switching"3.
The original HeadRoom was described by its maker as a "real analog spring reverb with two independent, instantly switchable channels," and RockBoard's PedalPedia entry calls it "purely analogue"24. The Mini keeps the two-channel layout and the spring character but generates the reverb digitally in a compact pedal1. Delicious Audio describes its range as covering "everything from tight room ambience to vast cathedral-like spaces"1.
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Questions
Is the Carl Martin HeadRoom Mini analog or digital?
The HeadRoom Mini is digital. Delicious Audio's Paolo De Gregorio describes it as a pedal that digitally recreates the lush, warm spring reverb of the original. The original Carl Martin HeadRoom it is based on was a real analog spring reverb, so the Mini carries the name and the character of that design forward in a digitally emulated, compact form.
Does the HeadRoom Mini have true bypass?
For the HeadRoom Mini, Delicious Audio lists buffered bypass, which the publication says ensures signal integrity even in long pedal chains. A 2011 demo video by Pete Thorn of the original HeadRoom spring reverb described that earlier pedal as having true bypass switching, so the two versions differ on this point.
Can the HeadRoom Mini run in stereo?
Yes. The pedal has mono and stereo inputs and outputs, and Delicious Audio notes that it adapts to both standard setups and immersive stereo rigs. A player can run it mono on a single amp or place it at the end of a stereo pedalboard.
How do you switch channels on the HeadRoom Mini?
The HeadRoom Mini has dual independent channels, and you switch between them instantly via the Select footswitch. Each channel has its own set of controls, so you can set up two different reverbs, such as a bright room sound on one channel and a longer decay on the other.
Is the HeadRoom Mini a real spring reverb?
No. The HeadRoom Mini digitally recreates the spring reverb of the original Carl Martin HeadRoom, which was a real spring reverb pedal. Delicious Audio calls the Mini the modern version of a classic real spring reverb that won many hearts a couple of decades ago, but the Mini itself uses digital emulation in a compact pedal.
Sources (4)
- Carl Martin Headroom Mini Stereo Reverb, Delicious Audio, 2025-08-19
- HeadRoom, carlmartin.com, 2026
- Carl Martin Headroom Reverb, demo by Pete Thorn, youtube.com, 2011-11-17
- Headroom by Carl Martin, RockBoard PedalPedia, 2026
