Listened to some tunes last night and noticed that I had more music than ever before. More subtleties were apparent like a soft guitar twang in the background that wasn't there before or clarity that was once considered clamor. The only recent change in my system has been a dedicated line. My tube amps, which are surprisingly quiet anyway, now exhibit slightly less hum.
The saying goes, "The devil is in the details," but in audio, the detail is where the magic resides. In fact, it's the illusive 2% more sound that audiophiles strive to squeeze out of their systems.