On 2012-10-03, Eric Carmichel wrote:
At least I got as far as 2*pi radians / 5 = 105 degrees.
To add, you can find the classical first order decoding equations for regular polygonal layouts in either the BLaH series of papers, or Gerzon's originals. They're all present in the Motherlode, with the first BLaH one residing at http://decoy.iki.fi/dsound/ambisonic/motherlode/source/blah-decoder.pdf . I'm certain others on list remember the filenames of the rest of them.
Seriously, the math for speaker feeds from B-formatted material isn't at all daunting, though I can't say the same for A- to B-format conversions.
The processes are full duals, with the exception of spatial aliasing artifacts.
The remaining five (should I go this route) will have equal spacing among them.
If you can, you most definitely should because that's as optimal as it gets. That one extra speaker then has to be a) completely separate, or b) it will lead to a decoding equation which you most probably won't be able to solve without resorting to numerical optimization.
Some of the VST plug-ins provide B-format-to-5.1 surround conversion, and a 5.1 layout (minus the 0.1) could work for me, too.
There you should look into G-format, which is an optimized 5.0 decode of B-format, also remaining revertible to the original three channel pantophonic reduction of full B.
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