Jeff- Actually, with no sub you are quite correct. But if I didn't have a sub, I'd just go full range. That's what people did for years with just plain old "stereo".
Everything I have read (and heard), particularly Dolby and THX info, also says that 80 Hz and below isn't localizeable. In fact, I had a Yamaha receiver for a while with a 90 Hz crossover, and I didn't find a problem with that either. Very specific test tones tests and controlled conditions, maybe, but watching a movie with audio and visual input to the brain, I think that 80 Hz and below is pretty safe. That's why, for example, the official THX crossover setting is 80 Hz.

[This message has been edited by Kevin C Brown (edited July 15, 2003).]