i have had a few of the DC series, refs, and c2ks. on the highs/mids, i've ran all of them as well. in the DC's i ran a 1000.4DC passive, then a 650.6DC active on the fronts, passive rears. loved it. now i run a SP7-SL EQ with a c2k 6.0 on my fronts passive and love it. it has so much more...