On Tue, Mar 27, 2018 at 08:01:20AM +0100, Jack Reynolds wrote: > As far as I know, higher order ambisonics over loudspeakers has > a quite confined sweet spot. Higher order spherical harmonics > produce an in phase and out of phase signal in opposite speaker > pairs. So if you pan a signal towards a particular speaker, the > opposite speaker will produce a lower level antiphase signal, > which will work when you are positioned equidistant from both > speakers, causing a certain amount of nulling of the air pressure > at that spot, but positive particle velocity, like a figure 8 mic > pattern.
It is unfortunate (and strange) that after all those years this sort of misinformation is still spread. I can only attribute it to what seem to be two properties of 'the web': anybody, no matter how misguided or malicious, can post whatever he/she wants, and the web never forgets. To put this straight: yes these antiphase signals in the opposite direction do exist. But first, their level goes down as order increases, and second, any decent AMB decoder will use this form of decoding only for low frequencies (where 'low' depends on the size of the rig). At mid and higher frequencies a 'max-rE' decode should be used, and at third order and above the produces very such low levels in the opposite direction that it doesn't matter anymore. Third and higher order will work very well for larger systems - IF DONE CORRECTLY. Ciao, -- FA _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
