May I add? I have recently added a Definitive Super Cube 1 to the 2 CH system in my home.... I tried to like the added lower extension to my Klipschorns for which I have the xover set to 40 Hz. mainly for organ recordings or when the pedal organ is added to underscore the orchestra.
But alas, I have decided to leave well enough alone since the K'Horns have robust low end response to about 28 Hz. (tested with a sine wave sig. gen.) ... I'm only missing the bottom 6 notes of a 32' pedal stop...
However, symphonic bass drums are pretty much all there thank goodness, and so the SW sits and looks pretty ;0)
......Gary
PS. This is my first posting, I believe I will enjoy it here!