Do ensure speaker line imputs are on what ever sub you select, AND the more control of contour on the sub will be of immense help too, phase, slope, level, cut off, and the better/finer the adjustments the better... if at all possible. Not all subs wil have every mentioned option.
HSU. SVS. Def tech SC2 or SC1. Velodyne SPL series
good luck
HSU. SVS. Def tech SC2 or SC1. Velodyne SPL series
good luck