Hi Dave,
If one is using a dedicated line for the AV system, will refrigerator line noise still be an issue and will the EMI trap work best for those without dedicated lines? Thanks.
Glenn
Glenn, Having a dedicated line is the best thing a person can do to get on the road to musical Shangri-La. It does only isolate the line back to the panel and uses inherent self inductance and capacitance to effect any noise rejection. The refrigerator noise will always be present in the neutral of all circuits, even if it is on the opposite phase at the panel. Consider that neutral and ground are "essentially" the same thing and you can see how this is still a problem.
As far as working best? Uhm, it may be more noticeable on a shared line, but will work well for any application.
HTH
Dave