68pete: I have added 3 of the MC-0.5s to my system. The first was added to an unused AC outlet that also feeds my HFC URH power conditioner, i.e. it is added in parallel to the PC. I then added 2 more MC-0.5s to unused outlets on the conditioner itself. All three made a significant difference in the ways you, I, and others have described, mainly much more substantial sound. That said, I found the first MC-0.5 plugged in parallel with the conditioner made more of a difference than adding 2 to the conditioner outlets. Whether this was due to the first making the biggest difference in itself, or whether it was position-dependent, I don't know. I have not gone back to unplug the parallel MC-0.5 to then determine whether plugging the 2 waveguides into the conditioner outlets would have made the biggest difference. I have just been enjoying the music too much to conduct an engineering design of experiments.