Where's "TheBland" when you need him. He has a killer setup and I've learned a lot from his posts. However, Tom is right with him. It's horns. Most Movie theaters (well, the good ones for sure) use mostly horn speakers. They're not the greatest for music, but for h/t they're terrific and can provide the 'whisper' sound with the loud stuff and make both sound realistic.
There's also lots and lots of speakers in there (usually). Most are behind the screen, where you can't see them. The sound system in an Imax theatre is incredible.
But as Speqtre alluded to, you need a very large budget to acheive that. Also, it helps if you only have a dedicated h/t with all the room treatments, and not (like 95% of people) a mulitpurpose room that serves for music listening, video gaming, plain old t.v. watching, etc.
But go with the biggest horns you can fit comfortably in your room, and at least two big subs (like an eD A7-900 or the Epik Conquest) and you should get something pretty darn close to a movie theater.
"it's better to have it and not need it than to need it and not have it"