jafant "If you are using this Sub(DD 15) in a H/T set-up, yes repair it. Otherwise move on to a REL for a Stereo system set-up." What is a REL?
I am currently using my 18" DAyton UM18-22 in sealed box with Lt1300 external plate amp in super large room (with B&W Nautilus 804 as fronts) for stereo, SACD and H/T. The Velodyne would either supplement (? not sure if possible and/or feasable to run 2 different subs) or be used in 2nd system (normal room size) for stereo and SACD.