Thanks to Mike at Brilliant Zen Audio I recently checked out the K-Works Peripheral Silencers. These are filters that are inserted into outlets outside of your main system line. I have a dedicated line for my audio system, so I installed a few of these in other rooms of the house. I do have a dedicated line, so I was very pessimistic about these having any effect. Well, Mike was right, I did hear a positive difference. With the Peripheral Silencers in my system, dynamics increased and bass tightened up. I thought I detected a little more detail and ambiance, but it was subtle. Overall it was a positive addition to an already tweaked system, so I bought them!
I would imagine that the K-Works filters would have a positive effect on every system, especially if you have dirty power(which I don't feel I do). If these sound interesting, give Mike a shout at Brilliant Zen Audio or better yet, go to T.H.E. Show this weekend in Newport Beach and check them out in person.