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No offense, but looks come in last place when picking my "audio" equipment.
Check out:
IDMAX 12 V3. is a GREAT sub. Just google it. Considered to be one of the best. Great bang for buck.

That is one reason folks don't use plywood. You can pickup some polyfil and stuff the box, will probably fix that issue Your best best rebuild in MDF.
On the power how exactly did you hook up? Also...

Cody not everyone that blows their shlt up is an idiot. How about when Polk ships the wrong xovers in the box and you end up with fried xovers?

Or how about rating the equipment at 125 Watts RMS...

I can only assume you are running, all four speakers from the amp? you may want to consider running an active setup if your head unit will allow. This will mean using your amp to drive your mids and...

I see online it is 5"? Is that right?