I have two seperate power amplifiers with 3 prong chords. When I connect the amp to the speakers I hear a noticable hum/buzz that comes through although when I play music at low volumes, its not ...

I tested out a used High Fidelity X-Can v2 tube headphone amp at a local high end audio store. I tried it there and it was extremely impressive hooked up to some quality CD Player. There wasn't even ...