Question regarding appropriate amp to push a Rockford P2D2

NickBaragona

When I turn my car on, there is a constant thumping noise coming from the sub. Could this be a wiring issue, or is it more likely that the sub is damaged? I didn't think my tiny PBR300X1 could blow a P2D2-10 lol.

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SouthArk370Z

Drivers only do what the amp tells them to do, so it's probably not the sub.

Does the volume of the thump change with the HU volume knob? If so, then the sub amp is probably OK.
Does the frequency of the thump change with engine speed. If so, then suspect ignition interference.
Check power at the amps and pre-amps, starting with the sub amp and working my way to the HU. Might be some weird fluctuations.
Could be a signal grounding problem. Ground shields at one end only.

Edit: double-check speaker wiring. It may be the auto-protection circuit kicking in.

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