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You stated that your AC wiring was originally installed in the early 1900'S=
..The API Power wedge drains noise by sending it to GROUND.If your house wir=
ing dose not have a dedicated ground wire I would suspect that it can't do =
it's job properly.If you want the most out of your system then you should u=
pdate with at least one if not two new dedicated 20 amp AC lines to you lis=
tening room.That is the best place to start.