my husband and i just recently bought a home stereo to hook up to our tv. however he decided the bass wasn't good enough so he bought a separate 250 watt ultra linear powered sub woofer to attach to the stereo. now we cant seem to figure out how to get it all working properly. i don't know what were doing wrong but we just cant seem to get the sub working. the stereo works fine but we are lost on what were doin wrong. please help!