http://aronnelson.com/gallery/WGTP/BassBoostNotch
This is what is currently on my bread board for putting back the bass I filter out for smoothness thru the clipping sections. It also can do a nice small vintage notch or large metal notch.
If your using an open back capinet, it can add that closed back 4 X 12" bass feel. Enjoy :icon_cool: