On the long wall or short wall- Speaker set-up


I’m fortunate enough to have a dedicated room built over a garage with dimensions of 16.5’ W X 27’ L. 
Room will be vaulted with the long wall having the sloped ceiling and the short wall having the gable. 
Loudspeakers will be the PAP Quintets where I understand room treatment may be less extensive than required with box speakers. Is there a means to predict or measure the preferred set up or possibly left to the acoustic professionals. Asking for your personal experiences. Thanks all. 
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Showing 1 response by twoleftears

I recommend you experiment, if you can, with an angled/diagonal placement,  that's neither parallel to either wall.  You can mitigate a lot of room modes in this way.