Just a quick question for those of you that own the BX-100 out there: do any of you use the extension speaker jack for live performances? I have to admit, I've never used it with the volume over 4 - and for rehearsing at that - , and it seemed to add very little in the way of sound (yes, I know the jack is wired in series instead of the normal parallel) - will it start to become more apparent at higher volumes? Or is it just a selling point? I haven't been seriously considering it (since I'm mainly looking in to a new bass right now), but I've had a few thoughts on adding an extension cabinent (some sort of 15" or 2x10") to it for a little more volume and frequency coverage. Opinions?