1. A signal processor configured to select a cross-over frequency to attenuate a spectral notch in a cross-over region, the signal processor comprising a configuration to: measure a full-range subwoofer and satellite speaker response in at least one position in a room, the full range subwoofer and satellite speaker response characterized by; select a cross-over region from the full range subwoofer and satellite speaker response; select a set of candidate cross-over frequencies and corresponding bass-management filters for the subwoofer and the satellite speaker; apply corresponding bass-management filters to the full-range subwoofer and satellite speaker response to obtain bass managed subwoofer and satellite speaker responses; level match the bass managed subwoofer and satellite speaker responses to obtain leveled subwoofer and satellite speaker responses; sum the leveled subwoofer and satellite speaker responses to obtain a net bass-managed subwoofer and satellite speaker response; compute an objective function measure using the net bass-managed subwoofer and satellite speaker response for each of the candidate cross-over frequencies; and select the candidate cross-over frequency resulting in the lowest objective function measure.