I currently have a pioneer vsx-d409 receiver,pioneer dv-563a dvd,audio etc.. player,pioneer cst2100k tower speakers....i just bought a jbl scs136 surround speaker system to add to the additional system i have...is this possible to do?...i cant seem to make the sub work.. my reciever has 2 subwoofer connections but im wondering if im gonna need a y connection....Thanks for any help