Stereo Lab - FRANCINSTIEN T-Sym

FRANCINSTIEN T-Sym

FRANCINSTIEN T-Sym is the culmination of research and refinement of the original FRANCINSTIEN stereo image correction circuit. These stereo correction techniques have been continuously developed since the 1990s and FRANCINSTIEN T-Sym is a third-generation stereo correction process.
Implemented with non-causal digital filters, the FRANCINSTIEN T-Sym is a (t-symmetric) time-symmetric, phase-linear process.
FRANCINSTIEN T-Sym is our flagship stereo enhancement/ correction process and is only available within the Stereo Lab App.

In the FRANCINSTIEN T-Sym correction algorithm, advantage is taken the time-symmetric, zero-phase response of certain digital filters to increase the steepness of the onset of the all-important frequency-dependent crosstalk. In this way, the difference between the low-frequency regime and high-frequency regime is more clearly defined. Analysis of the formation of stereo images in terms of wavefront reconstruction theory demonstrate this approach is worthwhile¹. Listening tests confirm it: the result is a stereo image of unprecedented clarity and "solidity"

FRANCINSTIEN T-Sym Demo

As a demonstration of FRANCINSTIEN T-Sym here is a recording of Beethoven's Bagatelle No. 25 in A minor for solo piano (commonly known as Für Elise) performed by Charles Metz on a fortepiano at First Congregational Church of St. Louis, Missouri in November 2019.

Captured using a Schoeps pair and FRANCINSTIEN T-Sym post-processing, the recording was kindly supplied by producer/ engineer: Barry Hufker. The photograph of the concert is by Pat Weaver.

Charles Metz performs nationally and internationally on various virginals, harpsichords and fortepianos. This performance used a replica instrument built by Paul McNulty who is based in Divisov in the Czech Republic.

For more information on the FRANCINSTIEN T-Sym process viewed as a wavefront reconstruction mechanism (like a hologram) is given here.

¹ Bennett, J.C. et al. A New Approach to the Assessment of Stereophonic Sound System Performance. J.Audio Eng. Soc., Vol.33, No.5, 1985 (May)

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Apple Certified Developer. Stereo Lab, Aria 51, Aria 20, Head Space, Groove Sleuth, iLOOP and FRANCINSTIEN T-Sym are trademarks of Pspatial Audio. FRANCINSTIEN and Bride of FRANCINSTIEN (BoF) are trademarks of Phaedrus Audio. Macintosh and the Mac logo are trademarks of Apple Computer, Inc.