Sorry - it is an AFM. It looked like a typical bling voltmeter....
I don't have a mic hooked up and even with all levels muted it still happens.
The AMP is a Kicker zx350.2. I don't have any separate crossover.
ok, what are the crossover settings set to on the amp?
Before I go look. What *should* they be so I can change them if incorrect. Thanks
Most subs should not see anything above 100 Hz, maybe 120 Hz
Crossover is set to LO and 110 Hz.. It was making the noise even without Windows being loaded.. Also, no cell phones were in my truck either (I've heard those causing sound issues before).. Should I turn the frequency down?
Try removing the inputs from the crossover alltogether, Is the noise still there?
Try bypassing the crossover, go straight from you head unit or computer into the sub, with no other signal. In other words dont play music or anything, just see if the same noise is there.
That noise is well above 110 Hz so should not make it through the crossover.
110 should be low enough, though you can try to turn it down to 80, or even its lowest setting to check if it willl remove the noise..
did you happen to do anything to the amp recently?
i had a issue similar to this a couple of months ago when i was trouble shooting my own ground loop issues, and tried "lifting the ground" by applying power to the negative rca input briefly-- it resulted in messing up the amp-- so it output a constant tone..