I have been wondering the same myself, I am not sure if a PS 300 would help-seeing as it is line regenarator, or if it would add a compressed sound/image. I am not sure if just taking the edge off of the a/c current would help ala Shunyata Hydra. I can tell you from my personal experience that the panamax doesn't do anything but allow me to sleep better at night. Some one else give us a hand!!!!
~Tim
~Tim