Does the receiver provide the power to the Sub.? If not, then you either connect the sub. with an external power amplifier or maybe just a new power sub.
Or you might just connect it the old method and see if the the low frequency come through there or not. Have fun.
I just purchased a new Pioneer VSX912 (Dolby Digital) receiever that has a single RCA type subwoofer output. The receiver basically expects you to connect this to a newer powered subwoofer (which I don't have). I have an older power amp (dbx xb140) and a seperate 15" dbx subwoofer. The amp has 'bare wire' inputs for left/right speakers and the same type outputs to left right speakers as well as the subwoofer. What is the best way to hook this up to get the most out of my components? Thanks.