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Spot on Joe. And since free air subs are not designed to work in a specific controlled volume, the design of them limits the excursion of the woofer, which limits sound. So it would take lots more...

Yeah, I didn't think that panel was boxed in, mine is just flat, and the screws might be buried under that carpet, I am not sure, since mine is older, but that panel has to come out somehow. Climb...

Are you using a free air subwoofer? In order to mount the sub the way a regular speaker is mounted requires a special sub. Free air subs aren't very loud either. I have a 10" sub in a sealed box...