Theoretica BACCH-SP ADIO 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, correcting certain distortions inherent in normal stereo reproduction so that you can hear the musicians located in space the way the recording engineers placed them and allowing the listener’s brain to receive the proper psychoacoustical cues that are needed to localize recorded sound sources realistically in 3D space. With BACCH, you can hear sounds in up to a 360 degree arc around your listening position, which is potentially much larger than the normal 60 degree arc of stereo sound. BACCH processing provides a dramatic, easily audible and more accurate rendition of stereo presentation, with very few downsides. This is likely one of the few major technological shifts in audio in the last 25 years.

I experienced some of the most natural three-dimensional sound I’ve ever experienced. The only time I heard anything like it during my time in Munich [2023] was […] when I enjoyed [The Bavarian State Opera’s] production of Verdi’s Aida from a prime seat in row 13 of the orchestra..

– Jason Victor Serinus, Stereophile

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:

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.
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.
64-bit audio processing through a dedicated multi-core CPU running custom-built algorithms and optimized convolution engines.
Wi-Fi control of all BACCH-SP functions through an intuitive iPad controller on a dedicated iPad that serves as the sole remote control.

Individualized BACCH® Filter Generation

64-Bit Processing

Sub-Millimeter Head Tracking

31-Band 1/3-Octave Speakers Equalization

Specifications

Digital In	S/PDIF (RCA), USB
Digital Out	S/PDIF (RCA), S/PDIF (TOSLINK)
Word Clock In & Out	BNC
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
	S/PDIF (RCA), USB
ADIO MODEL ONLY:	Integrated DAC, ADC, and Three-Level Preamplifier
Analog I/O	4XLR, TRS, RCA
SNR	113 dBa
THD	<-105 dB, <0.0005%
Channel Separation	>110 dB
Max Input Level	+19 dBu
Input Impedance	10 kΩ

Visit us for a listening session and free consultation

You are cordially invited to experience Bliss. We are located in Minnetonka, MN on the Deephaven border. We accommodate visits by appointment only and give you our complete attention when you are here. You should expect to have the opportunity to listen to a reference-level system and being engaged in discussion so we learn how to best help guide you further along your journey.