Ground Loop isolator homebrew

I am looking for a simple circuit for eliminating ground loops on
various audio circuits (max is headphone-type power, say 2 watts).

I could use 1:1 audio transformers or 0.1uF caps. What are the
advantages/disadvantages of each?

Ken C

 

Audio transformer: disadvantages is that they are either crappy or expensive
(~$50 per channel), and bulky. Advantage is they work well and, if good
quality, sound excellent.

Capacitor: advantage is it is cheap and small. Disadvantage is that it does
nothing at all to solve ground loops. Also, for headphone or speaker
impedances, you'd need a lot more than 0.1uF - think more like 100uF, or
more depending on impedance.