I am sure this is a topic that has been covered to some extent but it probably bear5s repeating. I presently have an old velodyne subwoofer. I plan on getting either the new 350 or HSU VTF 2 v 3. If I use both subs in my system how do I go about setting them up. For instance: Do I use the same crossover point. How do I adjust the loudness and figure out the phase settings? Also, how do I place them? Also, I know the HSu and Axiom are superior. Am I better off just using the one. I am in a fairly large basement with ceramic floors. However, my listening area is fairly small maybe 10 x 12, with my couch set against a back wall. The m60's are angled and about 8 feet from the listening position and about 6.5 feet apart. Thanks in advance for your suggestions.