Check out the Furman Voltage Regualtor and then run all your PL8's off that one unit. I do not pretend to have the best ears, but I'll be damned if even I could not hear an audible difference of silence. I am in a row of commercial buildings with shitty power so it really helped me alot.
Best of luck....that or of course.....that could be the credit card companies somehow spying on you to somehow make sure you are at last utulizing all that kick ass gear they paid for!!!!
(Wait....now I hear it too!!!!
)