THE BACCH® STEREO PURIFIER
BACCH-SP Grand is a state-of-the-art, high-definition, digital audio processor, developed by Theoretica Applied Physics, 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.

THE BACCH-SP IS THE MOST ADVANCED DIGITAL AUDIO PROCESSOR 
for music playback today as it incorporates, for the first time outside the laboratory, a number of advanced technologies that combine to offer what amounts to a virtual reality sound experience for the audiophile

THESE TECHNOLOGIES INCLUDE:

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.

The past year has been transformative for Theoretica Applied Physics. Over the past 8 months, BACCH has received no less than 6 awards from the high-end audio press:

• Best Product of the Year 2022 (Technology Breakthrough), by the Absolute Sound
  

• “Best Demo" of Capital AudioFest 2022, by the Absolute Sound
  

• “Best Sound (for the money)" at Capital AudioFest 2022, by the Absolute Sound
  

• “Best Room" award at Capital AudioFest 2022, by Enjoy the Music
  

• “Most Coveted Product" of AXPONA 2022, by the Absolute Sound
  

• Audiophile Product of the Year 2022, by the Audiophile Junkie
  

The BACCH-SP has also been recently the subject of an extensive review in the Absolute Sound magazine, and BACCH was the main topic in 6 video interviews:

• Steve Guttenberg interviews Prof. Choueiri about Spatial Audio; for The Audiophiliac
  

• The BACCH-SP Stereo Purifier: A Preview; by Andrew Quint for the Absolute Sound.
  

• JansZen Audio's Valentina A8 Loudspeaker Versatile to the Extreme; A Perfect Match for the BACCH-SP; by Andrew Quint for the Absolute Sound.
  

• How to Achieve Realism in Music Reproduction (Part I); Matt & Don Interview Prof. Choueiri for Audioholics (Part I).
  

• How to Achieve Realism in Music Reproduction (Part II): Spatial Audio with Edgar Choueiri Matt & Don Interview Prof. Choueiri for Audioholics (Part II).
  

• Audiophile Product of the Year: The Audiophile Junkie interviews an actual [BACCH4Mac] owner.

Link to developers site:

Theoretica Applied Physics