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Well, I called Polk Audio customer service, and they suggested connecting a second subwoofer in parallel to cut the impedance down to 2 ohms. I did so, and both subwoofers are working. They still...

I have the following configuration, all brand new except for the head unit:

Pioneer DEH-400UB head unit
Polk Audio d5000.5 amp
Infinity 6030CS 90W 2ohm front speakers
Rockford Fosgate Punch 8"...