Maestro faceplate - does it make a difference?

Just to mix things up a little the ones I sell are actually resonantors. I know what you're thinking - why would you want to put something that resonates there?  Thus, you can employ them on UNUSED outlets as well as outlets for audio devices AND outlets for non-audio devices with good results.

Or maybe Geoff buys his ceramic wall plates on Amazon https://images-na.ssl-images-amazon.com/images/I/41vDumcXTWL._SX425_.jpg for $3.82 and offers them up to audiophiles that visit here or his website for $30.00. If I were to use these plates I would upgrade and  use a non ferrous brass machine screw for $.59.. Tom

Tom, are you high? My audiophile outlet covers are treated a number of ways. Sorry but I can't actually tell you how. Then I'd have to kill you. Do you really think I have a kiln here and produce my own ceramic duplex covers? That's special.

Most treatments are $5.00 per pound less shipping to and from. How many of these = 1 lb. ? Tom

Tom, you really are high, aren’t you? What on Earth are you going on about? This particular conversation highlights the differences between high end audio and pro audio.