Re: ground-loop problems

For what it's worth, all my prior systems had the power amps sitting
next to the preamps. The components were connected with unbalanced
cabling, and I never had problems with hum, noise, etc. Nor did it ever
cross my mind that any of these systems would be "better" with balanced
wiring.

Well they can't be 'better' since you're introducing extra electronics to
balance and unbalance the signal -- not many devices are balanced
internally.

This is not correct. Changing the circuit from an unbalanced input or output
to a balanced input or output does not add a gain stage.

The power amps were designed by John Curl, one of the "inventors" of
full-complementary push-pull amplification. I will ask him what topology the
Parasound A21 uses.


My Parasound components -- and the Apogee electronic crossovers -- have
both balanced and unbalanced inputs and outputs, and can be freely
connected as desired. Other than the fact that balanced cables cost
slightly more than unbalanced -- why would anyone in their right mind
use unbalanced cables? Balanced cabling is in every way "superior".

You also have a balanced output radio tuner? Record deck? Etc?

The tuner does, but I use the unbalanced outputs. We were talking about
power amplifier connections, anyway.


If your equipment is designed for balanced operation it's quite likely the
unbalanced connections are an afterthought and the screen connected to
mains ground.

This is common. It is not generally considered poor design.


.

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