I highly recommend you buy as close to full-range speakers for the rear as possible. I use floor standing speakers, the same type as the front left/right speakers. This places the tweeter and drivers at the same relative height to your ear. Also, speakers that utilize the same tweeter and drivers will be timbre matched all the way around. Most people will quote you that bass is non-directional, and the subwoofer can do all the bass output for the entire system. But I have read several articles that state that bass is not entirely non-directional. The human ear can determine whether bass originates from the front or the rear. So sending the rear speakers as much bass as you can would be beneficial, especially since your room is 17x27. Anyway, others out there may have a different theory, so let your own ears decide. If you must put speakers in/on the walls for either space or cosmetic reasons, I recommend placing them on the rear wall. I've heard a system with dipole speakers on the side walls, and I felt a lack of sound behind the listening position. Perhaps better speakers would do a better job. In-wall speakers have not really impressed me all that much. They effectively are using the air volume inside the wall for bass response. The ones I've heard are slightly on the boomy side when it comes to bass. Hope this helps you out.
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