Using the ceiling mount hardware for the QS8 surrounds, how much headroom do I lose (from the ceiling, to the bottom of the speaker)? I will be using the surrounds for the back corners of my room, but they will still be about 5 feet from the back wall. I don't want my beautiful surrounds to have head marks on them, I'm not really concerned about others' heads from my surrounds :-).

Thanks

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