I have this stereo my neighbor is letting try to see if I like it, it has plenty of power and good enough sound for my old ears. I can't seem to figure out how to get to the sub wooder controls, watched youtube vids. and read some things online, the sub worked with the rc cord and my old little Panasonic surround system that had a total 360 watts fine. when I get into the audio controls and scroll through I don't a sub title for adjusting the LPF level or anything else, Anyone have a idea of what i'm missing please ?