I use the THX 80htz. I don not want to blow up my $4000 Vienna Acoustics speakers. The sub. can take all the punishmint the Hulk can dish out. Set the speakers for small and use the spl meter to set up the room. I have found the the big bass slam actually gets a little old after a while and listen to movies at a lower volume than when the HT was new.
Have fun
Tim
Have fun
Tim