I visited very reputable dealer this weekend 2 hours from home. Wanted to test the Def Techs and the M&K. The dealer did not have the M7K 750s that I wanted to audition and is no longer going to carry the M&K line. I did get to hear the Def Techs. I auditioned both the power tower 2002TL and the 2006TL with the 2002 center and BPVX surrounds. They sounded pretty good with HT and music but I really wanted to compare to the M&K. He spent very little time with me auditioning very little material so I did not really get a feel for them. The dealer told me that the subs in the towers needed no separate sub which I would like to believe to avoid the expense, but do not want to "miss out" on the experience that true bass can add. Can they truly provide decent bass? Also, are the 2002TL worth the extra $1000 over the 2006TL? Thanks!