The good: Picked up this '68 B15N at a wicked price. The bad: It's loaded with KT-77s and an Eminence Big Ben 15'' The Ugly: I'm using it for GUITAR (and it smokes!) But... I'd like to use it for bass too. Even with KT-77s, I think it'll sound good, but caution tells me I should use a bass cab. So my question is this: what's the easiest way to hook up an 8 ohm 110 bass cabinet? At this point I figure I could get the 3-prong to 1/4'' adapter, but would there be a way to use the 1/4'' Ext. speaker on the back (perhaps just leave the primary speaker cable unplugged?) As usual, thanks for all the help.