If you put your room dimensions into one of the room mode calculators on the ’net, you can see where in the room it’s modes and anti-modes are located (always but not exclusively at the wall/ceiling/floor intersections. Other locations are in the middle of a room’s length, width, and height, as well at 1/3 and 2/3 intervals). If possible, do NOT position your subs (or speakers) at those locations.
ALL woofers work best at the intersection of room boundaries
I put my JL Audio subs on top of 4" X 18" x 18" maple blocks that have 2" Star Sound brass spikes under it. Under the Spikes I am using Herbies gliders.
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