|Like the Blumlein/EMI Stereosonic corrector, the Bauer/CBS corrector was eventually forgotten and never gained much traction. With the increase in headphone listening in the 1980’s due to portable stereo radio’s and the visionary Sony “Walkmen” Cassette player, the Bauer/CBS corrector was revived and became known generically as Crossfeed.
However, while traditional Bauer crossfeed and its various derivatives do substantially remedy the “in-head localisation” problem, the result is a sound stage that may be best described as “wide mono”, much of the natural spaciousness of recordings are lost.
So Bauer/CBS derived crossfeed is still a rare feature. More often than not gimmicky and sound degrading DSP algorithms are promoted as enhancement to headphone listening that only distort the original recording more, rather correct the fundamental problem.
At iFi we have been building on research that extends as far back as the late 1980’s at the RFZ in Berlin, which suggested that a very different Matrix to the Bauer/CBS one is required and that additional martix coefficients are required to present a natural and spacious soundfield, like that from a speaker based stereophonic playback system.
Starting with this foundation we have applied further research and large scale listening tests to derive a purely analogue matrix, that translates a spacious stereophonic recording with good imaging when replayed on speakers into its equivalent when listening to headphones. That is 3D Holographic Sound for headphones, not crossfeed, not crossfeed plus something, but a fundamentally new way to correcting recordings made for speakers to replay correctly on headphones.
For Loudspeakers: (Line Outputs)
The Holographic for loudspeakers® is an analogue matrix circuit that has two distinct functions:
1. Corrects the fundamental spatial distortion in stereo recordings;
2. Increase the width of the apparent soundstage beyond the width dictated by the loudspeaker placement. The Holographic for loudspeakers® is an analogue matrix circuit that has two distinct functions:
+ (Original recording width)
30°+ (Original Recording Plus 30 degrees)
60°+ (Original Recording Plus 30 degrees)