Electro-Harmonix Stereo Polyphase XO
Electro-Harmonix Stereo Polyphase XO

Stereo Polyphase XO, Phaser per chitarra from Electro-Harmonix.

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content in English
Audiofanzine FR 04/12/2008

Electro-Harmonix Stereo Polyphase XO : Recensione di Audiofanzine FR (content in English)


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(Originally written by solo84/translated from Audiofanzine FR)
Analog phaser

One mono input, one stereo output

Lots of settings (waveform, envelope, feedback, LFO, start and stop points, speed, etc.)

It works only with a 24-volt PSU (included, no battery operation)

It's a pity that the unit doesn't have a stereo input! It would make it a must-have!!! I give it a 9 because of this last point.


The unit requires some learning time and I'm only getting to know it. The user's manual is ridiculous and the settings aren't intuitive. But it's only a phaser so you'll surely find out how it works! I will update this review later...


With a simple setting for arpeggios (Pink Floyd 70's sound) the result is very interesting, not as extreme as a Phase 90, quite organic and much more subtle. It reminds me of the Small Stone... The device doesn't alter the original signal and the stereo imaging is wonderful.

Everything is possible, even extreme effects! It's a convenient phasing effect unit! The phase start and stop controls and the feedback setting provide huge sound possibilities! You can also use an envelope instead of the LFO, etc.

I haven't tested it within a mix yet even though it's the most important thing! So I will update this review later...



- Very nice sound

- Unaltered source signal

- Huge editing possibilities

- Look and construction


- Not easy to use

- Ridiculous user's manual.