get 7 foot 1 inch speakers, then you can use them to support the ceiling...dual purpose
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Why people bother to waste time posting when they have nothing useful to share? Worse when they are cynical about a perfectly genuine question
I believe if speakers is too near to ceiling , it's similar to placing speakers too near to sidewall. There are a lot of software to help u to check out room mode issues with such close placement to ceiling
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.
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 really do not believe tall speakers are an issue. I have owned 8' tall electrostatic speakers and 6' tall dynamic speakers without any problems. Most of the really tall dynamic speakers place their drivers in a D'Appolito configuration, so the midrange and tweeters are not close to the ceiling anyway. Having the speaker near room bounderies (floor and ceiling) supports bass response and I seldom hear anyone complain about too much bass.
I would think you want to avoid early reflections of ceiling similar to walls. Usually there is less distance to work with in regards to ceiling and floor than walls even.
I like to keep my speakers as low to the ground as possible but also with adequate elevation from floor. Having drivers as close to listening position elevation or slightly below is probably a good practice in general.
Tall line arrays might be a different story, but good ones that tall will cost a fortune.
you know what, take advantage of the situation & use the lower height of your ceiling to make your speakers a line-array-like speaker. Line array speakers use the floor & ceiling to make them appear as an infinite baffle speaker. So, if you get a speaker with a radiation pattern that can make use of the floor & ceiling you'd have a fantastic soundstage height (& depth if you do this right). Line arrays do not have to cost a fortune (but they can). Check out VMPS speakers & those from Selah Audio: