Hello all A/V demigods, Short version: When playing sound from TV or computer to my amp, I get a 50-60Hz hum over the sound. This does not happen when only TV / only computer are connected.

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 ...

Sometimes, when you plug an audio line from a desktop computer into a stereo receiver or amplifier, an annoying hum comes through the speakers along with the music. You stop the music and the hum is ...