I just got a LC2i installed. My factory volume goes up to 40 and when I turn around 19-20 the subs don't go any louder only my door speakers get louder. What does the Accubass, Main, and Bass knob do on there. How do I level it out so my bass louder when I turn it past 19 or 20. I have a picture of how the settings are right now.

