Speaker height vs ceiling height

Ihcho,
There is no exact answer, If the speakers had an ever so slight tilt downward, you might get away with 5 ft to 5 1/2 ft, but in general I agree with Audioblazer. A boundry must be considered. Again, in general I would say 4 1/2 foot max. Depending on dispersion patterns of the speaker you choose and even how far your seating position is and how loud you listen, this could change.

Height is not nearly as big of factor as length and width are. For someone to say you could not put a 6ft speaker in a 7ft tall room is making a way to blanket statement. IMO.

Thanks all. Looks like things are more complicated than I thought. I would not try anything taller than 5 foot.

Chad,
most room mode calculators treat the ceiling as just another surface . It may absorb more energy than say.....a slab floor or sheetrock wall, but still and all, you must treat it with respect.
Construction makes a big difference.

The mitigation is the order of drivers. Tweeter at top of a TALL speaker may interact more with the ceiling while the woofer at the bottom, may interact more with the floor.

He may be able to get away with a tall line source?

I do not really qualify to address the issue, but intuitively I would certainly leave couple of feet between speakers and ceiling for dynamic speakers. Panels might tolerate less space above them, I guess. And horns...I have no idea.