MTX does have some pretty decent subs, considering they are commercially available. You just can't compare a product for the masses like MTX to a sub for the few experienced users like, such as Fi, DC, RE, etc.
The 9500, and the other high number models, can be made to perform very well and get loud, imo they're overpriced, but its also on the shelf at some electronics stores, so +1 to mtx for catering to the masses, somone has to.