On the SVP-CL pre-amp there is a five position Ultra Low knob which, according to the description in the owners manual, would be useless to me. Why didn't Ampeg instead put in a five way low frequency adjustment just like they did on the mid-range? There could be five settings from 20Hz to 200Hz and I could boost or cut the chosen frequency. Now that would be useful. Maybe someone at Ampeg just wasn't thinking.