As always, Fons has hit the nail on the head.
Dave
On 27 March 2018 at 19:40, Fons Adriaensen <f...@linuxaudio.org> wrote:
> 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
>
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--
As of 1st October 2012, I have retired from the University.
These are my own views and may or may not be shared by the University
Dave Malham
Honorary Fellow, Department of Music
The University of York
York YO10 5DD
UK
'Ambisonics - Component Imaging for Audio'
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