"I never realized how much this device was adding to the sound until I decided to unplug it and just see if it really was doing anything. When I first got it I plugged it in and assumed it was doing something - wow was I was shocked when I unplugged it after a couple of months in use! The sound became diffused and blurry, the texture was now gritty and grainy. It amazed me just how much noise the device was filtering out and how much it improved the sound. How clear the images became, how transparent the soundstage was; truly it was a night and day difference, the value of such tweaks is usually negligible. I don't see this as a tweak anymore, its an essential component for digital playback."