I have QSC K-8 and the Yamaha dxr and dxs series 12in and 15 subs ans it is a very good product for yhe money QSC K-8 star of the bunch . yamaha a bit punchy and a little trebley but over all very good I use system for outdoor concerts and they do very well.
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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 .