bman, Serenity is a pro. He does this for a living. He can apparently work magic with rooms and systems.
There is something wrong with your 600 or maybe the sub cable. If you have the time and desire, I would suggest you try to resolve this. A sealed sub is far more satisfying than ported and that 600 should be good for 7500 cu ft rooms. There's a big difference between boomy bass and smooth, transparent, articulate, linear bass. The Axiom sealed subs are designed to be ultra-linear with high dynamic power. There's a defect lurking somewhere. That defect by the way could be your ears or your expectations if what you were used to before was boom boom.
