Read about this pearl in Jim Smith's book Get Better Sound: If you are using a CD player, try turning it off and unplugging it from the wall outlet. Wait for one minute, not any longer. His theory is that this allows the computer in the the CDP to reboot. I would presume this should also benefit outboard DACs. I tried it and could tell a difference the first time I did it. Everything sounded better, clearer. I do it weekly now, but not detecting any further gains in SQ. Bottom line: my system sounds better. And it cost nothing.