Hey guys, I installed a pair of mm651's in my rear doors a couple weeks ago and everything was working great. All of a sudden I'm getting some nasty alternator whine.
I re-grounded the amp in a different spot... still whining.
I pulled out the RCA's and ran them outside of the car to get them as far away from the power as possible.... still whining.
I unplugged the RCA's from the head unit.... still whining.
I tried grounding the preouts on the head unit in case it would work like it does for Pioneer head units (mine's a Kenwood).... still whining.
I plugged my ipod directly into the input on the amp for the rear speakers... still whining... from all four speakers... what the heck...
There is no whine when there is nothing plugged into the inputs on the amp, but there is a slight hiss. Nothing noticeable without putting your ear right up to the speakers.
What else can I try? And why did this come on suddenly? The amp has been in the car for a few months and there was no problem until a few days after the last time I added something to the system. (The mm651s)