Hi Thornton.

Does the buzzing happen with the engine off or on?

Does it increase with RPM's (if the engine is running)?

Might be a bad ground connection.
or the power cable is to close to an other
power source. Ex:blowerfan,relays and wires.

Polarity or phase reversal only results in deminished
output.

Louis

PS: I just read your other post.

What I would try is,wire the HU directly
to the fusebox(bypass cars wiring),If a relay is
the problem then this should prove yes or no.

An other possibily is that the HU is not compatible
with the factory amp,but the Eclips is a quality HU
and should have no problem with the amp.