Furutech 104-D Carbon Fiber Hi-Performance Duplex Outlet Cover Plate - Premium Electrical Wall Plate for Home & Studio Audio Systems

This little item actually did make a difference. I replaced my plastic outlet cover with this carbon cover from Furutech, and my sound improved. I wouldn't say that the sound difference was drastic, but it was noticeable. I am using a Sony STR-1080 av receiver and Klipsch speakers and this little Furutech outlet cover definitely improved my sound. The most obvious difference is, the sound was louder after installing the device. I actually had to turn down my subwoofer a little, as the loudness in bass was most noticeable. If you want a slight upgrade for about a hundred bucks, this outlet cover is a good investment.