Glad you are going with the DD12. When I was demoing at the time the previous generation subs, the HGS-10 and HGS-12, I ended up with the HGS-12. More output and still just as quick as the HGS-10. I would assume the same with the DD10,12 since they still use the same drivers and amps as the HGS series.
Velodyne DD10 vs DD12
Is there a big difference in sound between the two? I have around 2500 cubic feet in my room. Thanks all.