Put them where you want ,if you have 2 put them on opposite sides of the room .Dual subs will cancel most nulls, try them in phase and out of phase. I let Audyssey calibrate them as a pair. If you are still not happy I suggest a DSpeaker Antimode 8033. It is highly unlikely you will beable to place them where they sound best anyway. Try not to overthink this since you haven't got a room specifically designed for HT.

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