thanks, good to know one will do it, however, this osd has b amp. input from b amp, and you can select on box wich amp you want to use, on what set of speakers, i thought about patching rca rear amp out, to tape in on another yamaha i have, then hooking it to b. in on zone box , and using other three pairs there, as yamaha manual sugg. one can power another amp. from center out, pre outs, or front, mainly to increase output, but i don't need additional output, but thanks again, just needed to know, don't want any overload problems,thanks again, here we go