Zu def 2 bass amps

Ok I have Def 2s in a large room they have good bass but not really awesome bass. Not using external amp. If I amp them with an xover I should be able to up the bass as I want, right?

Is it a lot better this way, for large rooms? What are really good bass amps not too pricey?
I think you need to look at your room before exploring that option. Most likely the problem lies there.