I have the base radio with the infinity speakers. Well.. Sound bar now house Boston acoustics.. Anyways. For clear, undistorted sound. (Poly fill in sound bar and sub enclosure...) Bass/ -6. Mid/ -3. Treble/ +9 balance/0. Fade/2R. Good luck
There isn't a way to "remote" into the subwoofer for increased sound, that I'm aware.