Speak to one of the Axiom specialists. They will probably point you to an EP350. Depending on the height of your ceilings, anything less than 2500 cu ft (H*W*D) would suffice for a sub smaller than the EP500. There would be less volume to fill. However, if you plan to eventually move and set up in a larger room, go for the larger sub and adjust volume accordingly

Epic Grande Master 500 w/ on wall VP180