Hey Wayne, Yes on the "mini Planers" being sen. enough for the little Zens I run Steve's Se34I which has a wopping 7 watts of power! The Mini's are about 98db/w/m 8ohms in stock form and I am looking at about 101db/w/m 4ohms or 16 ohms for the stacked version. I do not factor any gain from the OB, but it does seem to contribute about an additional 3db. The little Zen's are about 2.5 watts and actualy "Like" 4ohms(even 2ohms). Darrel