You just guessed my plan. I'm going to use the dark gray on the VW Scirocco, powdercoat my wheels and door handles black, black mirrors, black windshield frame, black hardtop.
it is an attenuation device. Max on the bass knob is going to be like not have the knob hooked up.(IE whatever your gains are set at) turning the bass knob down, lowers the volume. hope that makes sense.