CTXMatrix – Advanced Crosstalk Cancellation Plugin
Free 64-bit Beta for Ambiophonic 3D Stereo
(Download Version 1.3 released on 19 Jan 2026)
CTXMatrix is a free 64-bit VST3 plugin that delivers a full 180° 3D soundstage from conventional stereo speakers using an enhanced recursive crosstalk cancellation approach.
For the complete setup guide—including speaker recommendations (20° ideal vs wider angles), preparation with the single-ear occlusion test, the full five-stage calibration process (with alternating occlusion checks after each stage), baseline settings table, usage tips, installation instructions, and technical notes—please read the comprehensive README here: https://ambiophonics.wordpress.com/2025/10/01/readme-for-ctxmatrix/. Checking it first resolves the vast majority of questions. Watch the video below.​
To get the plugin: Download CTXMatrix Lite Version 1.2 directly from the link at the bottom of the page. . This version was specifically made to address latency problems some users encountered with Foobar2000, while keeping the core Mode fully intact.
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For support, questions, issues, or feedback: The fastest and most helpful way is to post in the comments section below (or on the README page itself). Many common questions are already answered in detail in the README, so reading it first often solves things right away. Public comments let me respond once for everyone, allow users to cross-reference similar problems, and build a useful archive for the community.
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Email replies can get delayed or buried because of the high volume of repeated questions that the README already covers—using comments is usually quicker.
When reporting issues via comments (or email if private), please always include these key details so I can help effectively:
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Your speaker angle, including the actual distances A (speaker-to-speaker) and B (speaker-to-listener) as mentioned in the README for double confirmation.
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Stage 1 delay and attenuation values.
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Stage 2 delay and attenuation values.
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Stage 3 delay and attenuation values.
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Stage 4 delay and attenuation values. Also mention the specific audio track where you're noticing the issue. If I can't access it from my collection, Apple Music, or YouTube, I'll reach out for a sample.
​​Key Features
Full 180° soundstage using speakers placed at ±20° to 65°. 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 details provided with the plugin).
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Critical Calibration Advice
Successful results depend on carefully following the five-stage procedure outlined in the comprehensive Readme. 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 too loud, there won't be enough subtle cues to detect the precise shifts. Play softly during calibration, then enjoy music at any volume afterward.
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For in-depth preparation, speaker setup recommendations, the full step-by-step calibration process (including the single-ear occlusion test), usage tips, and a table of approximate baseline settings for different speaker angles, please see the complete Readme here: https://ambiophonics.wordpress.com/2025/10/01/readme-for-ctxmatrix/
Technical Notes
Delay values are expressed in samples; displayed figures are approximate and for reference only. The plugin is statically linked with all necessary components and works on most modern Windows installations without external dependencies. If you encounter loading issues, installing the latest Microsoft Visual C++ Redistributable usually resolves them.