I had an overly long winded post lined up and deleted it. If you lived closer Nick, I'd lend you mine to try. They are boxed up anyways.

The rolloff in sealed is made up by better room gain. There is a thread at HTS where 2 sealed subs dug down to 9hz in a room your size at over 90db. This only works in enclosed spaces of reasonable size. I'll try to dig up a link. Cool stuff.