Were is the amp getting its power, it should come straight from the battery not from the Headunit. And is the static only from the subs or is it radio interference?
If it is radio interference I am thinking maybe the wire is loose at the antenna and maybe the radio is only picking it up from the wire itself, and when the subs cut on the magnetic field is enough to mess with the reception.
Also the radio ground in the factory location isn't always the greatest, I know several people who went to the extreme and ran a ground from the radio to the frame.
If you have access to another amp you could throw that in there and give it a try.
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