my sony stdg500 will not detect subwoofer anymore, it plays all the other speakers. is it because i'm using spkr a / spkr b and i have large set of spkrs attached on it i.e. 2 front 1 ctr 2 back + another pair attached on front as spkr b plz. help sub setting on recvr is set to "on" its a passive/non-powered sub that came with the all-in-one dvd home-thtr in a box surprisingly, the sub works fine when u plug it in on the dvd hmethtr box but just not with the audio recvr. is there any special setting that i have to look into or what... can i factory reset it back to dafault settings ?? will it work ?? i tried regular rca cables as well as digital co-axial too (but just used rca video instead for co-ax)