only the good loc have the gain knobs so dont be surprised if u get it out and there are none there, but while you are in there you should go to Radio Shack and grab 4 100mf caps and put them on your mids and highs in all 4 doors they will block your bass at the rate of 6db. @the cut off frequency i think that's about 100hz at 4 ohms but you can check that. I don't have a chart in front of me.