Originally Posted by
alarkyokie
DC? (what you get from rectified AC)...not an issue..
Forget the EE calculations..power isn't being used in an RF fashion.
Think grounding circuitry,proximity induction and you'll get the hum.
Sound engineers understand such.
Strictly speaking, rectified means what you get after the diodes and is "DC" in that it is not allowed to go negative. If you were to use that as your supply rail you would be quite a bad sound engineer though. What you get after the capacitors is DC, for the most part, with still a lot of 120Hz and harmonics left over from whatever the wave is when you have a 60Hz sinusoid that can't go negative and usually the source of most noise through coupling on the LOW LEVEL audio. Speaker audio is much higher level and not subject to such noise.