"Dave Plowman" wrote

Most audio stores will allow you to demo these devices
for free so there is no financial risk. The cost of these
units start at $200 and run up to $4,000 depending on
your needs.

For a few chokes and capacitors at most?

For example, better designs might include having isolated
transformers, balanced design technology, regeneration of
the wave form, outlet isolation/open ground, provide for
special need of source/power amps just to prevent
electrical grid injection noise.


Some people have more money than sense. Better to
buy equipment where the maker has catered for possible
mains borne interference.

And, some people have bad credit (no plastic) which
prevents them from trying a free demo unit in their home
setup. Or they don’t know any better. Which are you?


For a periodical review of these units check out
Stereophile issue Vol. 17 No. 12.

Love to know how you arrange for a 'dirty' mains supply
to be anything like typical.

Consider doing your own home work (empirical experience).