Ge0 wrote
Just out of curiosity, how do you have your amp mounted? Is the heat sink
to the amp grounded to the vehicles chassis or is it isolated? Many times
manufactures will tie the heat sink of their amps to the internal power
supplies floating secondary ground in an effort to eliminate ground loops.
Now, if you bolt the amp to the vehicles sheet metal you reconnect that
ground path. This not only can induce noise but can damage the amp.

This irks me to no end. Why would someone (some company) design a product
this way? What would ever possess them to make an amp for a car that you
can't mount on metal? And heck, if they really want to build it so that it
needs to not touch metal ... build it so that it CAN'T ... arg, just makes
me very angry ...

I'm done ranting for now.

--
Regards,
Dan Snooks