"Don Pearce" wrote in message

On Tue, 15 Jul 2003 21:26:05 -0400, "Arny Krueger"
wrote:

"Don Pearce" wrote in message

On Mon, 14 Jul 2003 09:12:51 +0100, Jim Lesurf
wrote:

Do people still use electrolytics as signal path coupling caps
these days in 'audiophile' equipment? I know that other types show
charge storage effects, but this should, I hope, not be audible
with decent designs handling musical signal patterns.

Plot the AC signal path of an amplifier's output stage and you will
find that the supply decoupling electroloytics are in series with
the speaker - they function as speaker coupling caps. I am not
aware of any design that has done away with this topology yet.

It makes a big difference whether the caps are inside or outside the
feedback loop.

Doesn't change the fact that they couple current into the speakers.

Which is another way of saying that feedback doesn't do much for dynamic
range.

But feedback does improve the accuracy within the dynamic range limitations.

And of course everything, including the speakers themselves, is inside
the feedback loop.

Say what? To put speakers inside a feedback loop you have to accurately
sense their acoustical output in a timely fashion, and that has always been
a problem.