"Phil Allison" wrote in message
...

** Listening on headphones while operating the "stereo-mono"
switch on my amp:

Segment 1 is plain mono.

Yes.

Segment 2 has some ambience coming from L & R of center -
which disappears entirely when switched to mono.

That was the producers' brief, total mono compatibility with
no change in the original sound.

Segment 3 in simply out of phase - the level drops by over
15db

Yes. It was done to illustrate the importance of the ratio
of centre to side signals. Normally the centre signal needs to
be some 6 to 10dB stronger. In segment 3 the levels are
equal.

In fact, I hear swishy cymbals on all three segments.

That's probably due to the low res of the track which I
posted.

http://www.kolumbus.fi/iain.churches...StereoDemo.mp3


Iain