I don't see much wrong with them. It's not really the larger drivers, it's more that it can be a problem of one kind or other to get them into a "small" enough box and still sound very good. And there's the problem of the lack of proper control enough to integrate them well into the room and system...which is my complaint of virtually any sub out there you can name.
I think servo subs can work well, but it's really all the rest of it that needs to be thought out most, first.
I don't like subs generally because they are designed as an "add on" to the system...a bandaid. They are designed that way because they are approached that way. "Hey, it's a subwoofer and that's what you want, right?" Just more fully resolving the bass/room/system interactions could possibly be a better thought, subwoofer or no.
Regards
I think servo subs can work well, but it's really all the rest of it that needs to be thought out most, first.
I don't like subs generally because they are designed as an "add on" to the system...a bandaid. They are designed that way because they are approached that way. "Hey, it's a subwoofer and that's what you want, right?" Just more fully resolving the bass/room/system interactions could possibly be a better thought, subwoofer or no.
Regards