[Audio Empire]

On Wed, 24 Mar 2010 03:54:59 -0700, Arny Krueger wrote
(in article ) :

"David Nebenzahl" wrote in message
.com

I'd say that since a differential amp practically
eliminates common-mode noise, there's no reason *not* to
use one (which, after all, was the question the OP asked).

Transformers are an effective means of elimination common-mode noise. They
are as a rule more effective than differential amplifiers. If you have an
input transformer, you don't need a differential input and you pick up some
inherent protection against EMI and casualty losses.

Now that's interesting. My sources all say that transformers have a lower
common-mode rejection ratio than can differential amplifiers.

If you've ever had a grounding problem that a standard active differential
input can't handle, you know what I mean.

Yes, we all have in-line isolation transformers in our kit-bags for just such
a contingency.

snip