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   Home » Playback Listening » The open project: a lateral cross-injection. (26 posts, 2 pages)
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  »  New  Preamplifiers: keys to mystery. (Lamm L1, L2)..  In analog domain...  Audio Discussions  Forum     2  47367  11-14-2004
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rowuk


Germany
Posts 281
Joined on 07-05-2012

Post #: 26
Post ID: 25521
Reply to: 19195
The phase trick is actually not that difficult
Hafler, Carver, polk and most professional mastering has a technique that actually came from MS recording techniques. A MS microphone array has a "mono" microphone and a figure 8 bipole microphone above it. The stereo spread is controlled by altering the balance of the "l+r" uniphase channel with the bipolar l-r signal. Changing the proportions in an acoustically well made recording does not "screw things up". It simply changes the balance of l+r to l-r and widens or narrows the soundstage accordingly. In many playbacks, this extends the image far to the left and right of the speakers - without losing the center image or losing bass response. As the hall ambience is random phase, it of course gets the "most" effect.
I Think that the original specification for the Hafler circuit used by Dynaco called for a 7dB lower lever for the l-r/r-l speakers. Dynacos idea of putting the "phasey" speakers behind the listener is pretty smart (if time alignment is adhered to).


Whenever I feel blue, I start breathing again.
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  »  New  Preamplifiers: keys to mystery. (Lamm L1, L2)..  In analog domain...  Audio Discussions  Forum     2  47367  11-14-2004
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