[LAU] Where do the 60 degrees for stereo come from?

[Philipp Überbacher]

Excerpts from Julien Claassen's message of 2011-06-16 22:21:43 +0200:
> Hello Philipp!
>    I suppose with 60 degrees you mean the two times 30 degrees, that the 
> speakers should have. I always thought it had very trigonometrical reasons. So 
> at your head you have an angle of 120 degrees, which is a wide angle, that 
> might fit the ears nicely, since they don't look like they would make a 90 
> degrees angle at your point of the triangle. Something in the back of my mind 
> tells me phases came in as well. But unfortunately I have nothing more 
> definite. Someone will though. Fons should, since I think he once explained it 
> to me with perfect reasoning. So should a few others.
>    Sorry, I couldn't be more specific.
>    Warm regards
>             Julien

Thanks for your response Julien,
yes, I mean the two times 30 degrees in front of you.

I hope to get a reasonably scientific answer (if it exists).

Regards,
Philipp