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by Ralph Glasgal
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PC, MAC, iPad, iPod, iPhone, Android and Linux Products

Ambiophonic Transcoder and iPad/iPhone Player from Xivero

Click on the images below to find out more about these new products from Xivero.



Ambiophonic App for Android
Neutro Music Player
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.

VST plug-ins available

This VST version of RACE has two controls for recursive delay and attenuation parameters to adjust for a variety of speakers, listening room geometries, and recordings.with unusual stage properties such as 40 foot pianos. As with other RACE implements, needed for surround are two instances running of the VST plug-ins and hardware that supports 4.0 or 5.1 input and 4.x output. (Note: a 5.1 center input must be mixed into L & R front channels by setting the player to "no center").

Ambiophonic DSP

AmbioDSP vst plugin

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.  A user guide and ordering information can be obtained by going to www.filmaker.com/products.htm   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.

Ambiophiles tools

DIY Ambiophonics & PanAmbio surround

Recursive Ambiophonic Crosstalk Eliminator (RACE) -- turn your PC into an Ambiophonics DSP

You must install AudioMulch on your computer, learn how to use it, and then load the free .amh file into the program. The AudioMulch screen is shown below with some installation notes. Using a digital input or a .wav file, direct the AudioMulch output to your sound card, built-in speakers or cd burner.

* Using a browser capable of displaying formatted XML (XML with tags) such as Internet Exporer, click here to display the file in a browser window. Save the formatted XML as RACE40.amh or any suitable name with an .amh extension.

* Download and install AudioMulch www.audiomulch.com. Open your .amh file in AudioMulch. Your screen should look similar to the image below.

AudioMulch screen
(See Tutorials-Understanding and Installing an Ambiophonic System for further advice on adjusting the program parameters

An Alternate Configuration from Chris Nalder

This process isolates the monophonic component of the stereo input and allows it to reach the output without being processed by RACE. In M/S parlance, the S signal is processed by RACE and matrixed with the unprocessed M signal to produce the normal left and right channel outputs.



Configuring Surround Speakers for Concert Hall Ambience

One principle of Ambiophonics sound reproduction is that the frontal stage generated by RACE (and optionally enhanced by Envelophonics) should be complemented by concert hall ambience either recorded as a rear pair and reproduced from 4.0 media using RACE in the rear (Panambiophonics) or generated from real concert hall impulse responses.  In the case of 2.0 (and most 5.1) media such as LPs and CDs using hall IRs is the only available option.   Indeed modern 3D hall impulse responses can be used to produce very natural spatial channels for virtually any number and location of ambience speakers.  An impulse response can be thought of as a recording of what happens to a single sample of sound launched from the stage and then bounces around in the rest of the hall. 

In the diagram below, AudioMulch a low cost digital audio workstation, and Voxengo (registration payment required for this version) can be combined to produce hall ambience for virtually any number of hall ambience loudspeakers using one ordinary PC or Mac computer.  The output is normally via a single USB cable which then needs to be demultiplexed into digital or analog signals for power amplifiers and speakers.  At this time such Multichannel Audio Digital Interface (MADI) equipment is only to be found in professional recording engineer catalogs.  The RME ADI-6432/MADIface USB is one example of such hardware.  Neither the speakers nor the amplifiers need be full range or expensive.  Even as few as two is better than none.  But the process of creating a domestic concert hall is not for those lacking computer or DIY skills.

AudioMulch screen


Thanks to Prof. Angelo Farina, and Dr. Justus Verhagen, 3D impulse responses are available for La Scala, The Sydney Opera House, and St. Cecilia.  These are 96/24 IRs and cover both an entire circle in the horizontal plane and a selection of elevations.  Provided below is a set of IRs from St. Cecilia, reverb time 2.2 seconds, for every 15 degrees in a circle at an elevation of 23 degrees but with some at the rear elevated by 60 degrees.  So if you put a speaker at 90 degrees to the right you would feed it a right stereo input convolved with the 90 degree IR. The IRs are .wav files and can be loaded into Voxengo which itself is a VST plugin that can be used in many programs.  It is not feasible to put the entire set of IRs for all the halls on this site but if you wish additional IRs please send an e-mail to glasgal@ambiophonics.org 

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