On Mon, Jul 09, 2012 at 11:13:04PM +1000, GP wrote:

> If the min is (N+1)².  
> Surely for 3rd order that is 
> (3+1)² = 16 speakers?

The minimum is (M + 1)^2 for 3D, and (2 * M) + 1 for 2D, but

- You better use at least on more,
- For 3D, the minimum is 8, even for first order. That is because
  the the equations above assume a systematic decoder, but a decoder
  should be systematic only at LF, and for anything based on energy
  vectors the angle between the speakers can't be too big. 
  
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)

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