It seems I didn't get a remote bass control with my kicker kx600.1 amp. I am going back to the audio store to see if they can install it for me. However, since it is a factory head unit, would it make much of a difference. My friend has 2 rockford fosgate 12's with a factory head unit and a remote bass controller and it doesn't do anything. I expected it to be where if I didn't want too much bass I could turn it down to a really low level.