The Keeley OAXA Phaser is a dual-engine modulation pedal from Keeley Electronics, launched in October 2025 at a street price of $1991. Where a classic phaser pedal gives you one sweep through the frequency spectrum, the Oaxa runs two independent phasers at once, each with its own LFO (the low-frequency oscillator that drives the sweep), and its true stereo operation lets you run those two engines in series or in parallel2.
For players chasing lush, multidimensional movement, Delicious Audio's Paolo De Gregorio wrote that the OAXA delivers far more than a classic sweep, with rich, swirling textures and chorusing-like layers2.
What it does and how it is voiced
A single three-position toggle selects between three voices: lush 10-stage phasing, crisp 4-stage, or vintage uni-vibe1. More stages means more notches in the frequency spectrum and a smoother, more complex sweep; the 4-stage setting is the classic compact phaser throb; and the uni-vibe mode reaches for the vintage, pulse-like character of the original Uni-Vibe effect. Guitar Pedal X's Stefan Karlsson lists the settings on the Stages control as X (10), IV (4) and V (Uni-Vibe)3.
Delicious Audio describes the result as lush, multidimensional movement, with the two engines creating rich, swirling textures2.
| Control | What it does |
|---|---|
| Rate | Sets the speed of the phaser sweep2 |
| Depth | Sets how deep the sweep reaches2 |
| Mix | Blends the phased signal with your dry sound2 |
| Stages toggle | Selects 10-stage, 4-stage or uni-vibe voicing13 |
Secondary functions add 2-stage and 6-stage phaser voicings, different bypass modes and a few more variations3, and the pedal includes 11 demo slots3.
Two phasers, series or parallel
The Oaxa's headline feature is that it runs two independent phasers simultaneously, each with its own LFO2. In series, the two sweeps stack for a denser, more complex effect; in parallel, they can be spread across a stereo field. De Gregorio put it plainly:
"its true stereo operation is a game-changer. You can run the dual phasers in series or parallel"
The pedal carries two footswitches, labeled Phase One and Phase Two, so each engine can be brought in and out independently3.
Platform, enclosure and versions
The Oaxa is built on Keeley's Core series platform, which Premier Guitar describes as featuring large vintage-style knobs and a pilot light1, and which Delicious Audio says blends the rich, organic texture of analog with digital precision and reliability2. It ships in the same enclosure as Keeley's Halo Core, Rotary and Zoma pedals, with RCA-style knobs3. Two versions were announced: Purple as the standard finish and a Black Edition from the Custom Shop, both at $1991.
The Oaxa uses external power only, at 9 to 18V through a standard center negative jack, drawing 130mA1. There is no battery option, and the 130mA draw is worth checking against a small daisy-chain supply before you power it alongside several other pedals.
Where it came from
The Oaxa Phaser sits in Keeley's Core platform line, and like other Core pedals it keeps the controls simple: the effect is governed by three knobs, Rate, Depth, and Mix2. It carries a street price of $1991.
What reviewers said
Guitar Pedal X's Stefan Karlsson found the effect itself convincing but had one reservation about the format3:
"It's a really cool effect for sure - a Dual Stereo Phaser sounds pretty fantastic - but I would have preferred it the more compact enclosure."
He characterized the effect as vintage-styled, and noted that while the Oaxa shares the exact same format as the Halo Core, Rotary and Zoma Reverb, he would have preferred the more compact dual-footswitch enclosure Keeley uses elsewhere3. Delicious Audio, by contrast, called it a dual-engine modulation powerhouse rather than just a phaser2.
Videos
Premier Guitar
Keeley Electronics
Keeley Electronics
Questions
Does the Keeley Oaxa Phaser take a battery?
No. The pedal uses external power only, at 9 to 18V DC through a standard center negative jack, drawing about 130mA. There is no battery option, so it needs a power supply or an isolated pedalboard output.
Is the Keeley Oaxa Phaser true bypass?
It offers selectable true bypass or buffered bypass modes, so you can choose either depending on your signal chain. Buffered bypass can help drive long cable runs, while true bypass keeps the pedal fully out of the path when off.
Can the Oaxa run its two phasers in series and in parallel?
Yes. The Oaxa runs two independent phasers simultaneously, each with its own LFO, and its true stereo operation lets you run the dual phasers in series or in parallel. Series stacks the sweeps; parallel spreads them across the stereo field.
What is the Uni-Vibe setting on the Oaxa?
It is one of three voices selected by a three-position toggle, alongside 10-stage and 4-stage phasing. The uni-vibe mode gives a vintage, throb-like character in the vein of the classic Uni-Vibe effect rather than a standard phased sweep.
Is the Keeley Oaxa Phaser a stereo pedal?
Yes. The Oaxa is described as a dual true stereo phaser, running two independent phasers with their own LFOs. Delicious Audio called its true stereo operation a game-changer for players using stereo rigs.
Where is the Keeley Oaxa Phaser made?
Premier Guitar reports that the Oaxa Phaser is built in the USA by Keeley Electronics. It launched in October 2025 with a street price of $199.
Sources (3)
- Keeley Electronics Introduces Oaxa Phaser, Premier Guitar, 2025-10-23
- Keeley OAXA Phaser, Delicious Audio, 2025-11-05
- Guitar Pedal X, Guitar Pedal X, 2025-10-24
