Stereo Polyphase Discontinued - Analog Optical Envelope/LFO Phase Shifter

Experience cascading sweeps and gorgeous, panoramic imaging through stereo outputs. Generate seductive stereo phase shifting at its finest. User-defined start and stop ranges allow you to sculpt phase shifting to fit your performance needs. Optical circuitry provides a wide dynamic range making the Polyphase ideal for hot output instruments, including keyboards. Generate stereo liquid phasing at its finest.

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From the Blog
Posted 6/25/2014


Presenting "Education on Modulation Part 3" by JJ Tanis. Here the guitarist/educator describes and demonstrates phase shifting. JJ also put together individual videos on the Stereo Polyphase and the Nano Small Stone.

Check out JJ's YouTube channel:
youtube.com/janjaaptanis






These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 12/16/2011



Linkin Park’s, Mike Shinoda, takes us into the studio to share an inside look at some of his favorite EHX gear.

And congratulations to the band! They just received a Union Nations Global Leadership Award for their work supporting humanitarian causes. 

For more on Mike and Linkin Park, click here http://www.linkinpark.com/main

For more on the band’s latest humanitarian initiative, click here http://www.powertheworld.org/

From the Blog
Posted 10/14/2011



Pomplamoose, the talented duo of Jack Conte and Nataly Dawn, have created another awesome VideoSong. This one with the foreboding title “Bust Your Kneecaps.” Among the EHX gear used are a Stereo Polyphase and a Deluxe Memory Man

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From the Blog
Posted 10/29/2010

You are entering the EHX zone where Goblins and Goolies infest within diabolical guitar skills. Metallic clangs rasp against the midnight clock and rundown Lothar’s pipe organ to reveal a Halloween festival featuring Bill Ruppert as the caretaker.

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 9/28/2010

From New Dehli to the Australian Outback, Bill Ruppert dials in the shortwave radio bringing the sonic mysteries of the East skillfully cloaked within EHX designs. Sitars shimmer as tablas relay the rhythm. Magical kalimbas meet the aboriginal drones to weave textures that define the interactive power of each and every Electro-Harmonix pedal.

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 5/27/2010

Sonic sleuth, Bill Ruppert takes his EH pedal army to the forefront of Alien invasion. Bill’s creative combinations capture the eerie nuance and the tense attitude of the 1963 Dr. Who theme song. Integrating Electro-Harmonix pedals, Bill proves that EH designs deliver an amazing power whose outer limits are yet to be invaded.

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 3/14/2010

In Effectology 14, pedal guru Bill Ruppert takes us on a journey to previously unchartered sonic territory. Using only Electro-Harmonix pedals and his guitar, Bill creates a series of “believe it or not” soundscapes. Whether it’s the sound of songbirds singing joyfully by a babbling brook or a vintage vinyl “lo-fi” recording complete with clicks and scratches, Bill’s mastery of effects will amaze you. As he says, “Never judge what an effect pedal will do by what you have heard it will do. Experiment and you will find new sounds not yet discovered!” Indeed!

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 2/25/2010

Sonic master Bill Ruppert reproduces the legendary Pink Floyd synth textures from “Welcome To The Machine .” Using only his guitar and the perfect blend of EH pedals, Bill re-creates the amazing sound-scapes that made this recording special. Each EH pedal provides its own magic to reveal the complexity and textures of the EMS VC3 synthesizer with stunning accuracy.

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 10/7/2009

The great Bill Ruppert creating remarkable collection of sounds.

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 9/21/2008

Submissions to EHX.com
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Quick Specs
True bypass
Optional expression pedal
Stereo outputs
Feedback resonance control switch
Selectable LFO, envelope follower
Tough and compact die-cast chassis
24DC-100 power supply included
Dimensions in inches: 4.75 (w) x 5.75 (l) x 2.5 (h)
Dimensions in mm: 146 (w) x 121 (l) x 64 (h)
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Show your colors with genuine EHX tee shirts and authentic Electro-Harmonix accessories!
Get this limited-edition Day-Glo poster of the original 1968 art that inspired the Electro-Harmonix logo!

Mike Matthews stated: “The image on our Flashback Poster is of the original artwork that inspired the famous Electro-Harmonix logo. I think players who dig our pedals will also enjoy the chance to own a piece of EHX memorabilia.”
Did you know that Electro-Harmonix makes many of the world's greatest vacuum tubes? The next time you need to re-tube your guitar, bass, or hi-fi amp, be sure to insist on getting authentic Electro-Harmonix tubes.
Our new EH Strings allow you to capture every nuance of your playing style with lightning fast playability. Made of a pure nickel wrap with a specially-selected stainless steel, these sweet-sounding round wounds are truly like no other strings you've played. Not only do they last longer and stay in tune longer, but we think they're the best sounding strings ever made. Available in 9s, 10s and 11s.
Dig it, now you can rock EHX in our new heavy-duty black hoodie! It’s emblazoned with the iconic Electro-Harmonix Flashback logo in white on the left chest and back.