OK.. I'm kinda new to figuring out how all this works. I'm making plans for building my house.. which will have a movie room.
Question 1: If I buy a system, and want to add aditional speakers/woofer, do I need a more powerful system? Or I guess, what I'm wondering, do you have to, subtract how much power each speaker uses from the total power of the system, or is it, as long as a single one doesn't take more than the total, you're ok? Hmm.. I'm sure this is all probably obvious stuff.
Question 2: How bad of a thing is it to mix different brands?
Question 3: OK.. My main question here: I'm not even sure if there's an answer for what I'm looking for. I love mega base for movies. I want to
FEEL it when a building explodes!

So, can I stick sub woofers under the seating.. or, is there actually a company that makes vibraters for the seats? lol. ya.. anyway.
Thanks!