Depends on the intensity and room size.
Honestly these mentioned setups are probly not real amazing like we make it sound. My uncle is an ht freak, a fast processer on his tv, and a his recieved cost grands but I dnt remember the cost, I don't know what subs he has but it kills a movie theater by a mile. And the sq is setup nicely too. Best ht I've ever heard.
I'm sure plenty of people using caraudio subs will windup getting a response they think is nice and loud but when they learn how to build the right box or get the right subs is when the ht really amazes you.
You have to learn some and get the experience before you realize the best types of subs to use.
If you go sealed with a moderate amount of power like 150 or so the make sure suspension is compliant(loose). Sealed will kick butt and sound better if you get a subwoofer with decent compliance and a good size box for it.