Theoretica Bacch-SP Dio Two Channel DSP


Shop All Theoretica




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 psychoacoustical 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 through high-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 control of all BACCH-SP functions through an intuitive iPad controller on a dedicated iPad that serves as the sole remote control.

The Dio is the digital pass-through version of the Bacch-SP and thus has no analogue section.


Digital Inputs
1x USB
1x BNC Clock

Digital Outputs
1x Toslink (Optical)
1x BNC Clock

Other Connections
1x RJ45 (Network)
1x USB (IR Camera)
1x USB (WEB Camera)

24-bit Audio, 64-bit Processing | Sampling Rates: 44.1, 48, 88.2, 96, 176.4, & 192 kHz
Dedicated iPad as Remote Control | Remote Technical Support, Maintenance, and Software Upgrades via the Internet

Due to the bespoke nature of our high-end music systems this product is not available to be purchased online. Please contact us for personalized service from one of our team of experts.