i have Pioneer FH-P5000MP CD Player when i got it installed there is no option of subwoofer.i reset the unit now a subwoofer option is availiable to turn it on or off.i have no woofer.so when i turn it off the audio dont come out when i turn it on there is a lot off bass which make the sound quality very poor.i dont want to use the subwoofer option so how can i do it.please help...