BURNHAM wrote
> This all sounds very complicated!
I agree. Quadraphonic equipment manufacturers developed complicated
and strange techniques when they tried to improve what already was poor
to begin with.

That's why I asked, would you try to "enhance" two channel stereo by
constantly
wiggling the channel levels or the amplifier channel balance control.

- - -

I have always liked the egg yolk comparison:

You have a glass bowl and four chicken eggs.

If you break the eggs carefully into the bowl, you can see four complete
yellow yolks floating in the eggwhite. So far so good.

You just might be able to spoon most of each yolk into four cups from the
bowl with a steady hand if you were lucky. This compares to discrete
channel quadraphonics.

Enter matrixing: When you put a fork into the bowl and mix the bowl
contents,
you don't see separate yolks anymore. You can try to use a spoon to collect
a similar amount of yolk into four different cups, but you cannot be sure
anymore, which yellow came from which egg. This compares with matrixing
four audio channels into two.

Eero