Anyone with a mid-to-hi fi stereo should seriously consider these (room treatment products), before you upgrade in cables, or even more advanced equipment. I’ve been listening to high-end equipment for more than four decades, and I listen to music more than four hours per day. I don’t have superpower hearing, I just trust my ears? The panels and diffusors you provide are perfect, a bargain and the biggest bang for the buck! And they are well-acceptable in a living room.