I now have a pair of Salk Song Towers and the Song Subwoofer powered by my Ultravalve. Should I use a coaxial filter in the line between the preamp and the Ultravalve to limit the bass that the Ultravalve needs to handle, now that the sub has those duties. What frequency should I select as the cut-off? I have set the sub-woofer at 60 Hz cut-on. Thanks.
