Help with stereo in a cooler

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Pipes
Pipes Posts: 3
edited November 2012 in Car Audio & Electronics
I built a stereo in a cooler with
Poly planar MRD 80i head
Rockford Fosgate PBR 300x2 amp
Suriken battery
Polk mm651 speakers

The little amp runs very hot an d I would like to replace it with a Polk d5000.5 amp and add a polk 8" subwoofer. Is this overkill for the 651s if I bridge amp
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