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by Ralph Glasgal
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Ambiophonics for Any Taste and Budget 

No expense spared 360° high-end system using TacT components.
As above, showing Soundlab line source electrostatic speakers. Also includes mechanical Ambiophonic wall to allow convenient comparisons between mechanical crosstalk cancellation and the RACE program.

iPhone plus Ambio apps feeding iLuv docking station.

Ambiophonics implemented using a browser with full RACE controls plus option for headphone listening. FREE!!

Low cost adapter converts
stereophonics to Ambiophonics using standard audio components and any loudspeakers

Android app with SoundMatters for mobile 3D stage.

Apple iPad Ambiophonic apps perfect for docking stations.

Praise for Ambiophonics... click here for more comments from audiophiles

"I have no words to describe my first experience with Ambiophonics using the MiniAmbio.  My thirteen year old son summarized it as “this is so much better”.   I was tapping my foot which I don’t even remember ever doing before this…..If only I had shed my audiophile purist mentality 10 years ago when I first experimented with Ambiophonics I wouldn’t have wasted so many years chasing equipment seeking  stereo perfection."

-- S T Chelvam (Malaysia)

"I downloaded the Hotto Ambiophonic Transcoder to use in reaper and wow what a difference! For the first time in my life I am hearing music the way it was intended by the engineer and the musicians. I tracked a band over the weekend and right away I can hear what's wrong in the mix. Everything is so apparent and in your face. I am no longer being lied to by the speakers and the room I am in. I can hear when reverbs and delays clash with each other so much easier now. Honestly, I can't ever go back to listening to stereo ever again. It's such a waste of time. How can something so awesome be so unheard of? Everyone should be able to hear music this way."

-- Paul Herlihy, recording engineer

I spent the last day or so in the UK playing with the XTC (RACE crosstalk Cancellation) setup and was staggered by the improvement this can achieve in image precision, depth placement, stage width increase, and removal of crosstalk smearing.  The improvements were both dramatic and particularly surprising given the fact that my arrangement of the LS1s is nothing like the optimum Ambiodipole configuration (probably around 50 degrees rather than the preferred 20 degrees or so).  I can’t wait to try the XTC processing out in combination with the DRC!"

-- Andrew (TacT RCS user)


View of right rear Soundlab Majestic direct sound path

The large lab at Ambiophonics Institute houses the initial experimental no- compromise, high-end, 3D Ambiophonic system featuring front and dual rear full range SoundLab electrostatic Ambiodipoles, and electronics for the system's 30 speaker channels. Shown are some of the 24 SoundLab Surrstat electrostatic ambience speakers being driven by convolvers using real stored concert-hall impulse responses, thus allowing Panorambiophonic reproduction of most existing stereo CDs or LPs. A video projector and parabolic screen allow 5.1 operas, concerts and movie soundtracks to likewise be reproduced Ambiophonically with full circle localization of direct sound dialog and effects.

The chart above shows the s\results of listening tests conducted at New York University. Click here to read an interesting NYU thesis elaborating on this result.

Enjoy not only the Depth, Clarity, Realism, Envelopment, and Enhanced Transient Response, but also the 180° Sound Stage of Loudspeaker Binaural Reproduction when Using Ambiophonic Technology to Play Standard Media

Ambiophonic programs and components eliminate localization distortion, stereo loudspeaker crosstalk, produce front/rear sound stages (180°/360°), and deliver the high fidelity one ascribes to normal everyday 2-eared hearing. Loudspeaker binaural (in contrast to the stereo loudspeaker triangle) generates an unprecedented sense of depth, clarity and presence. Also, in the absence of stereo crosstalk, comb filtering and central low-bass energy doubling are eliminated making truly flat acoustic response possible. For live, large-scale music recordings the optional use of rear ENVELOPHONICS and/or surround speakers allows the construction of domestic concert halls that provide an enveloping, you-are-there experience especially for opera DVDs, or rock concerts, 3D movies, or games.


The home stereo and 5.1 reproduction arrangement that we are all familiar with is psychoacoustically flawed.  There is simply no way conventional stereo or 5.1 can recreate the panoramic spread and depth of sound we hear in concert halls, churches, theaters, or rock concerts.  With Ambiophonic sound reproduction, however, you really can be there.

For example, 2 microphones spaced 7 inches apart will capture a time difference of about 700 microseconds for a side source and this is what will be stored on the LP or CD; but when played back stereophonically this time delay will be reduced to about 220 microseconds and such a source will no longer be heard at the far side. Siimilarly, the level differences picked up by mics or panned and stored on disks or in files are similarly reduced during stereo reproduction so that a sound originally recorded at 90 degrees is now heard at 30 degrees.

Recovering this hitherto hidden localization data in ones existing library is what makes Ambiophonic listening siuch an adventure.

Tabs are provided to assist users with any degree of technical sophistication or lack thereof.  Whether you are component oriented or are skilled in the use of PCs, MACs, or tablets, we hope you will want to try Ambiophonics.  Use the technology you are most comfortable with.  There are also sample music and movie clips that you can listen to and/or watch to get a bit of an idea of how Ambiophonics compares to stereophonics.

We hope that when you do have your own Ambiophonic system going that you will let friends, manufacturers, media outlets, blogs, and forums learn of your experience.

Getting Started

The Ambiophonic method achieves exceptionally realistic reproduction of staged, acoustically or electronically generated music especially from the existing library of two-channel sources such as CDs or LPs.  Ambiophonic reproduction of most such existing recordings will outperform any existing or proposed surround, multichannel recording or reproduction system for music, video, or games.

The material here should lead to a better understanding of some under-appreciated characteristics of the human ear and provide a better sense of what binaural or concert-hall sound fields consist of, so that listening rooms can reproduce sonic events with consistent and unprecedented realism even when using the vast library of already existing two-channel recordings. The authors anticipate that not everyone will want or be able to implement all of the Ambiophonic paradigms but even employing one of these suggestions will increase the perceived realism of the reproduced sound. It is hoped that, over the years, audiophiles, equipment designers, sound/video recording engineers and magazine editors will come to better understand the goals and acoustical principles involved and apply them in the future to their own products, systems and reviews. Click here for a quick start tutorial.

What is Ambiophonics?

The Ambiophonics method combines an exploitation of seldom applied, but well documented, psychoacoustic principles with the basic rules of good musical performance space design to create believable concert-hall sound fields in dedicated home listening rooms. Ambiophonics moves the listener into the same space as the performers, by accommodating to individual external ear and head characteristics, minimizing interaural correlation at the listening positions, abandoning the traditional stereo loudspeaker equilateral triangle, recreating early reflections and reverberant fields via computer, and eliminating front and rear loudspeaker crosstalk. The Ambiophonic sound reproducing technique is a worthy successor to both stereophonic or surround-sound listening configurations, in that it can consistently generate a "You Are There" sound field even from standard LPs, DVDs or CDs that the ear-brain system will accept as real.

Ambiophonic Recording

Recording engineers should note that an Ambiophone 2/4 channel mic array has been designed to make 2 or 4 channel recordings that can reliably provide 180 degree or 360 degree direct sound localization anywhere in the horizontal plane. See RecEngineering Corner for details.


Protopype of new 4.0 Ambiophone

To hear excerpts from 2 and 4 channel recordings made with the Ambiophone click on the demo tab above.


Xivero/AMTRA Ambiophonic Players/Programs/Apps for PCs/MACs/iPad/iPhone

Ambiophonic App for Android

Click here to read about the Neutron Player with built-in Ambiophonic capability. Enjoy wide-stage 3D sound in the background while running multi-media sources such as games and videos.

First Component Products!


180° sound stage
With only 2 speakers


Experience the increased depth, realism & clarity of Ambiophonics

Ambio4You, a noted manufacturer of DSP audio products has developed a line of very affordable Ambiophonic products. Click the image above for product and purchasing information. Click here for information about the Ambiophonics plugin.

RACE 2/4 channel System
Using AudioMulch

See PC/MAC page for downloading and installation details.



Free AU/VST-plugin

Click here to go to Stephan Hotto's website for the download and a tutorial on using the plugin.

Ambiophonic DSP

Ambiophonic DSP

This is a very sophisticated version of RACE which includes a variety of novel adjustments to cope with unusual recordings, loudspeaker arrangements, or just personal preferences. 
Click here to download a user guide and obtain ordering information. Some non-vanilla RACE algorithms include Pop, Electro/game, Jazz/acoustic, Classical/movie, Wareing, and Bypass. Wareing is an example of nonrecursive crosstalk cancellation and was used extensively before RACE became feasible. A Zentrum control allows central soloists to be made louder or softer and a Space control boosts ambient content if desired. There are also memory locations to allow custom configurations to be stored and recovered. Two instances of this plugin can be used in surround sound applications or to enhance stage width and realism even when playing 2.0 media.

Note:  The non-profit Ambiophonic Institute hopes that other component and software manufacturers will avail themselves of this technology and include Ambiophonic features in their product lines.  All aspects of Ambiophonics are in the public domain and may be used without fees by any home user or manufacturer.  We congratulate TacT Audio for being first to include the RACE algorithm in a hi-fi component product.