Princeton University  

4 How can I add BACCH™ 3D Sound to my Hi-Fi system?

Recently Princeton University's Office of Technology Licensing licensed Theoretica Applied Physics, a Princeton-based company, to use BACCH™ 3D Sound in commercial audio products. Thoretica's first product is the audiophile-grade BACCH-SP.

The BACCH® Stereo Purifier (BACCH-SP) is a state-of-the-art, high-definition, digital audio processor that yields highly realistic 3D sound imaging from a pair of stereo loudspeakers.

At the heart of the BACCH-SP is BACCH® 3D Sound technology developed at Princeton University, which purifies stereo audio signals from the crosstalk inherent in loudspeaker-based playback, allowing the listener’s brain to receive the proper psycho-acoustical cues that are needed to localize recorded sound sources realistically in 3D space.


1) Individualized tonally-transparent crosstalk cancellation filters (called BACCH® filters) designed from quick calibration (impulse response) measurements made by the
listener using calibrated binaural microphones placed in the listener’s ears.

2) Real time adjustment of the 3D audio sweet spot though high-spatial-resolution
tracking of the listener’s head position (even in pitch darkness) using a 3D infrared
camera and advanced custom-built head tracking software.

3) 64-bit audio processing through a dedicated multi-core CPU running custom-built
algorithms and optimized convolution engines.

4) Wi-Fi-based control of all BACCH-SP functions through an intuitive and aesthetically
pleasing iPad controller on a dedicated iPad that serves as the sole remote control.

To learn more about the BACCH-SP, visitTheoretica's official website.

The BACCH-SP is now commercially available through the following licensed agents/dealers:

Audtech Associates (US and Europe)
email: j5652c@alumni.Princeton.EDU

MASIS Audio (Asia)