During Covid years, Kicker had supply issues with their amps. That created a few years with the amp not having the dip switches and bass knob port.Can you add a bass knob IF you wanted to? I purchased my sub from the dealership and it did not have the bass knob hole or the dip switches for adjustment on the amplifier. I called Kicker and they confirmed they had another supplier for amps and just use the equalizer in the radio for adjustments. Now I see folks that are getting these today have the knob system again.
I ordered mine last fall and they were back to using the their old amps with the dip switches and bass knob port.