I have been using the DXR 12 and the 15 DSR subs for about a year it is a pretty good system I use the system for outside concerts
I do feel the QSC system has a better sound but the yamaha is very good .
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Genos, PSR S970, Fender Tele Amercian Deluxe Cherry sunburst , Cubase Pro 8 ,Yamaha A3M Acoustric ,Taylor 814, Ibenez Artcore Custom Tascam DP 32 Yamaha DXR 10, QSC K-12, K 12 Sub K 8 Sinn 945
2 Fender Expo line units .