nope. never used a bass knob, never will.Do you have the bass remote plugged in? If so, disconnect it.
Double check your sub wiring. Possibly one coil out of phase.
You dont need a beefed up alternator, just some good batteries. Did you check wiring phase of the subs and If you are connected to sub output of the headunit then you need to turn it up. Just push the volume knob button and turn it up. Or connect to rear outputs.
Why do people insist that higher ones are important despite actual facts to the contrary?why did HU manufacturers go back to the lower outputs ?
it was the amp then should call up hifonics