Transform any conventional stereo loudspeaker setup into a convincing 180° three-dimensional soundstage with CTXMatrix, a free 64-bit VST3 plugin that implements an enhanced version of Ralph Glasgal’s RACE (Recursive Ambiophonic Crosstalk Elimination) algorithm.

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Key Features

• Full 180° soundstage using speakers placed at ±20° or narrower

• Five-stage calibration interface for precise delay and attenuation adjustment

• Stable, externalised 3D imaging with real-time crosstalk cancellation

• Completely free for personal and non-commercial use (full license included)

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Critical Calibration Advice

Successful calibration depends on carefully following the five-stage procedure in the supplied CTX Guide. Most important: When performing the occlusion test to locate the exact phantom image, the test signal must be played at a very low listening level (barely audible, close to your normal threshold of hearing). If the signal is reproduced at typical music levels or louder, there will not be enough attenuation for the subtle lateralisation changes, making it impossible to detect the precise null or shift in the phantom image. Only at very soft levels will the image snap clearly.  However, during calibration, you can increase the level but not too loud. Therafter, blast away as loud as you like when playing music. Read here for more details.

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Technical Notes

• Delay values are expressed in samples; displayed figures are approximate and for reference only.

• The plugin is statically linked and contains all necessary runtime components. It works without external dependencies on most modern Windows installations. Should loading issues occur, installing the latest Microsoft Visual C++ Redistributable from Microsoft will resolve them.

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• Beta17 .

  • You can find the latest version of Microsoft Visual C++ Redistributable Microsoft here .​​​

  • Download the CTXMatrixBeta17.zip (includes CTXMatrixBeta17.vst3, Readme, CTXMatrixLicense.html). Extract and copy .vst3 to C:\Program Files\Common Files\VST3. 

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