DIY sub/amp with LOC

Hi all, I've done the DIY for my car from http://www.tsxclub.com/forums/showthread.php?p=219291


but theres one problem...


only some songs have bass and some dont(when i know they should)


I've used the LOC


does anyone know what the problem could be?

06' lux SATNAV

thanks

ahhh.. delete this post ... i fiddled with the EQ and some wires.. got it working lol