On Sat, 27 Nov 2004 03:19:54 -0500, Bob Cain wrote
(in article ):



hank alrich wrote:

Since there is no way in the presently known universe to put two objects
in the same place at the same time, how can wavefronts that arrive at
different times null? Is this a fantasy test?

Not at all, Hank. While they can't be at the same place,
they can be at the same distance by placing one atop the
other pointing in opposite directions with their diaphragms
in the same plane and with that plane passing through the
source.

Here's a pic of a MS employing three little Panasonic WM55A
cards that I made to experiment with:

http://www.arcanemethods.com/MS-Ball-Off.gif

Yes, things arriving from off the horizontal plane will have
some TOA difference so there is assymetry that way but for
the direct sound, it can be quite time coherent.

That there is a front to back distance between M and S on
axis is ameliorated by the M being in the null of the S
there. At 90 degrees the distance between M and S is the same.


Bob

Then there's the consideration of how the mic bodies might alter the results
because of their obstructional presence.

Regards,

Ty Ford



-- Ty Ford's equipment reviews, audio samples, rates and other audiocentric
stuff are at www.tyford.com