One reason for looking to upgrade my towers is the fact I think they lack mid base. Initially I was bouncing between D17 and R700. I've got second thoughts on D17 since your review mentioned the D15 don't have that strong bass. I stumbled yesterday on the review of 8000f that shows they have stronger bass even than their bigger brothers, 800f, in room. So, how would you compare the 8000f against R700?
Regarding the D15, if I look at your measurements, they show reasonable spl down to 40 hz. R700 start to drop around 60 hz. So, why do you think R700 gave you better bass than D15, for movies?