The SV-1 Spectral Verb is a shimmer reverb stompbox from G-LAB, a pedal in the maker's REBEL line. Shimmer reverb adds a bright, octave-up sheen to the reverb tail, and G-LAB frames the pedal in suitably cosmic terms: "Spectral Verb is like a ticket into the outer space, and the three potentiometers determine the destination galaxy."1
Under the hood it is a hybrid design: a 24-bit DSP generates the effect while an analog signal path carries the audio around it. RockBoard's PedalPedia says this combination "results in a clean effect space while maintaining a str[ong]" character, keeping the digital reverb from clouding the dry tone.1 For a player, that puts it in the same family as other reverb designs on the Reverb Pedals page that mix digital processing with an analog front end.
The controls
The pedal keeps its face simple: three potentiometers set the character of the reverb. G-LAB's own description gives them the job of "determin[ing] the destination galaxy," meaning the three knobs together decide how far out the shimmer effect goes.1 The maker's user manual, available as a PDF in English and Polish from G-LAB's site, carries the full control-by-control detail.1
Build and power
The SV-1 sits in a powder-coated metal housing with what RockBoard's PedalPedia calls the "legendary footswitch you can find in other g-lab's" products, so the switching hardware is shared across the maker's range.1
Power comes from a 9V DC, center negative supply, the common pedal standard. At 120mA it draws more current than a typical compact drive or fuzz pedal, so it wants a dedicated outlet on a power supply with enough current available rather than a shared daisy-chain output.1
With a 120mA draw at 9V, the Spectral Verb rules out battery power and low-current daisy-chain outputs. Give it its own supply outlet rated for at least 120mA.1
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Questions
What power supply does the G-LAB SV-1 Spectral Verb need?
The SV-1 Spectral Verb runs on a 9V DC supply with a center negative plug, the standard arrangement for most pedalboard power supplies. It draws 120mA, so it needs its own outlet on a supply rated for that current rather than a low-output daisy chain output shared with several pedals.
Is the G-LAB SV-1 Spectral Verb analog or digital?
It is a hybrid design. G-LAB describes it as a combination of a 24-bit DSP, the digital processor that generates the reverb, and an analogue signal path, which the maker says results in a clean effect space.
What is the G-LAB SV-1 Spectral Verb's current draw?
The SV-1 draws 120mA at 9V DC, center negative. That is more than many compact pedals use, so plan your power supply accordingly and give the pedal a dedicated outlet with enough headroom.
Where can I find the G-LAB Spectral Verb manual?
The English and Polish user manual is available as a PDF from G-LAB's own site, at glab.com.pl, under the file name UserManual_SpectralVerb_PL_EN.pdf. The maker's product page links to it directly.
What is the REBEL line from G-LAB?
The REBEL line is the G-LAB product range that the SV-1 Spectral Verb belongs to. The Spectral Verb is the line's shimmer reverb stompbox, built as a compact pedal with the same footswitch G-LAB uses across its other products.
Sources (1)
- SV-1 Spectral Verb by G-LAB, RockBoard PedalPedia, 2026