if I split the preout with y chinch adapters and with it 1x in amp from the FS go with the other into the sub-end stage, which I use brittlely. then is automatically one channel in front away. I change left and right is each the other in front away. lies you can not switch the brittle one with the not brittle one so ? go I go each without y to both devices is everything i.o. gruss & beautiful weekend.