The AV12 is in ~1.05ft^3 fairly well-stuffed. The infrasonic filter of the AVA250 (Qtc = .96, Fc = 18Hz)will screw with things, but we can disregard that since this isn't the permanent amp/setup. I'll probably go with a few more Av12's and the LT, so I'd be willing to build the box to suit the LT as-is to get to my "wanted".