I just installed a new PA Plasma Series amp in place of my weaker rockford fosgate amp and the sound is MUCH clearer and louder now, HOWEVER... there is a faint humming noise that my laymen passengers wouldn't notice but us conisseurs of car audio would go nuts over.
The noise responds to the RPM level of my car... the higher the RPM's go the higher pitched the noise is and the lower the RPM's the lower pitched the noise is... it sounds like one of those noisemakers you blow with the little fans in them that whistle when they spin.
Now that I've explained the problem, how do I fix it? Where is this interference coming from and why was it not present at all in my old Rockford Amp (which no one will argue is of higher quality)? The same exact wiring was used, I just switched out the amps.