On Thu, Feb 21, 2013 at 12:13:54PM -0700, Martin Leese wrote: > If you have four subs then you might want to > consider arranging them in a tetrahedron. > Note that subs are heavy, so there is a > practical problem with mounting them up in the > air. (Arranging four full-range speakers in a > tetrahedron is not recommended.) > > Whatever arrangement you use, because the > frequencies are much less than 700 Hz, you > only need to drive them from a single-band > "vector" decoder.
Indeed, the tetrahron works with subs because you can drive them using a systematic aka max-rV decoding. Regarding the question if the two rings should use the same azimuths, or one of them should be offset by 30 degreees: it doesn't matter. That is so because the two horizontal rings don't have any preferred directions or 'speaker detent' - the resulting rV or rE is the same for all azimuths. So 'interpolating' between the two rings will always produce the same result, regardless of the relative speaker positions. This is why an arrangement like 1 + 6 + 8 + 6 + 1 (at -90, -45, 0, +45 and +90 degrees elevation respectively) works well for full 3rd order 3D: any vertical circle has 8 equally spaced intersection points with the horizontal rings and zenith or nadir speakers, so it will support 3rd order elevation perfectly. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
