The Keeley Suns Ultravoid Fuzz is an analog fuzz pedal from Keeley Electronics. RockBoard's PedalPedia describes it as a refined take on the company's Moon fuzz, with a redesigned tone stack that provides a tighter low-end response and a tone that is sharper and more focused than the original1. It runs on 9V DC, center negative2.
An op-amp fuzz with a tighter low end
The Suns is a multiple gain stage op-amp fuzz, according to Guitar World's reviewer Alex Lynham3. That puts it in the same circuit family as Keeley's Moon, which Delicious Audio described as a "rather simple, 3-knob + 1-toggle quad op-amp Muff-style fuzz" designed to extend guitar or bass frequencies as low as possible4. The Moon line began with the Moon Op Amp Fuzz, announced in April 2022, where MusicRadar noted the tone control had been re-imagined to tighten up the range, coming out cleaner and much more gainy at the same time5.
The Suns takes that idea further. Guitar World's review says the tone stack has been redesigned to eliminate low-end complaints and retain a resonant bass response3, and Keeley's own description says the redesigned tone stack provides a tighter low-end response, resulting in a tone that is sharper and more focused than the original Moon1. Guitar World's news coverage of the launch described the pedal as delivering a biting, sandpaper-smooth fuzz2.
The reviewer also found the pedal easy to live with:
"The Suns feels like it has the same 'set and forget' quality"
The controls: Level, Filter, Fuzz
Keeley arms the pedal with a simple control set: Level, Filter, and Fuzz1. Guitar World's review confirms the same three controls3, and its launch coverage adds that there are controls for Level, Filter, and Fuzz2.
| Control | What it does |
|---|---|
| Level | Output volume |
| Filter | Tone shaping, part of the redesigned tone stack that tightens the low end1 |
| Fuzz | Fuzz amount and gain |
Unlike the Moon, which pairs its three knobs with a three-position toggle offering flat, mid-boosted or mid-scooped tone shifts5, the Suns keeps things to the three knobs.
The reactive clipping LED
One feature that sets the Suns apart visually and sonically is its clipping LED. RockBoard's PedalPedia says the reactive clipping LED elevates your every note into the stratosphere with a lively, harmonic-rich, and dynamic feel1. MusicRadar's Jonathan Horsley describes LED clipping that responds to your picking dynamics and yields lots of juicy harmonic content6. Guitar World's reviewer called it "a gratuitous, but fun, LED that shows the pedal clipping"3. Guitar World's launch coverage ties the two together, describing a pedal that hinging off a reactive clipping LED "launches every note into the stratosphere with a lively, harmonic-rich" and dynamic feel2.
Power, bypass and practical details
The Suns Ultravoid Fuzz runs on 9V DC, center negative, the standard supply format for most pedals1. Guitar World's review lists it as true bypass, so the pedal is out of your signal path when switched off3.
Keeley builds the pedal in the USA, "right along with the rest of Keeley's boutique-level stompbox creations"1. If you want to compare it with other Keeley fuzz designs, the company's range includes the Octa Psi Transfigurating Fuzz, the Black Glass British Fuzz and the Holy Fuzz.
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Questions
Is the Keeley Suns Ultravoid Fuzz true bypass?
Yes. Guitar World's review lists the Suns Ultravoid as true bypass, so when the pedal is off, your guitar's signal passes through untouched. That matters on a pedalboard where fuzz pedals are often placed early in the chain, since a buffered pedal can interact with other fuzzes or with your guitar's volume control.
Is the Suns Ultravoid Fuzz analog?
Yes. Keeley lists the Suns Ultravoid Fuzz as an analog circuit. It is a multiple gain stage op-amp fuzz in the same family as the Keeley Moon, rather than a digital model of a fuzz, so it responds to your guitar and picking dynamics the way an analog fuzz circuit does.
What power does the Suns Ultravoid Fuzz use?
The Suns Ultravoid Fuzz runs on 9V DC with a center negative plug, the standard pedal power supply format used by most stompboxes. Keeley lists this on the product's specifications, so a regular 9V DC center negative supply or a standard pedalboard power output will run it.
What does the clipping LED do on the Suns Ultravoid?
The clipping LED reacts to your playing. Keeley says it elevates every note with a lively, harmonic-rich and dynamic feel, and MusicRadar describes LED clipping that responds to your picking dynamics and yields lots of juicy harmonic content. Guitar World's reviewer called it gratuitous but fun, showing when the pedal is clipping.
Where is the Keeley Suns Ultravoid made?
The Suns Ultravoid Fuzz is made in the USA, alongside the rest of Keeley's stompbox range, according to the product's listing. Keeley Electronics builds its pedals in the United States, and this pedal is no exception.
Is the Suns Ultravoid Fuzz a Sweetwater exclusive?
Yes. The Suns Ultravoid Fuzz was released as a Sweetwater exclusive at $99, part of a trio of Keeley and Sweetwater collaboration pedals announced in January 2025 alongside the Super Bass Overdrive and Distortion and the Soft Reverb. Keeley's listing states you can only get it at Sweetwater.
Sources (6)
- Suns Ultravoid Fuzz by Keeley Electronics, RockBoard PedalPedia, 2026
- Keeley launches $99 Sweetwater-exclusive pedal series, Guitar World, 2025-01-06
- Keeley x Sweetwater Soft Reverb, Super Bass Overdrive and Distortion and Suns Ultravoid Fuzz review, Guitar World, 2025-03-10
- Keeley Moon Fuzz, Delicious Audio, 2022-12-21
- Keeley announces Moon Op Amp Fuzz for Gilmour-inspired tones and beyond, MusicRadar, 2022-04-21
- “This supercharged amp-in-a-box pulls no punches in channeling the hallmark haymaker that inspired it”: Keeley Electronics and Sweetwater team up for exclusive $99 fuzz, overdrive/distortion and reverb pedal collection, MusicRadar, 2025-01-03
