@ GordonC...I had an RCF 15" subwoofer already as part of a PA I own, so I just brought it from my band's practice room for a while, since we are on hiatus as a gigging band for the time being...I am using my Radial DI to feed the sub, since the input is XLR type, not 1/4" phone jack. I eventually want to have an all tube setup, with the theremin going into a full parametric EQ which in turn would feed a crossover with the high output going to my Blues Junior and the low output going to the tube head for the bass. I would use the parametric EQ to flatten out the coloration produced by the cabinets.. I know that this isn't the pure classical setup that coalport describes, but it would enable me to have the Blues Junior behind me a little below head level, with the additional joy of having maybe a dedicated 18" woofer to provide the awesome (and non-traditional) bass that you and I love. For now, I have my guitar amp up on a little table so that it's about 4 feet off the floor, and that works for me just fine, since I am currently in the chops building phase of my development.
@ coalport....I definitely have some baggage, but I carry it, not the porters. Some of the transatlantic passengers actually were able to get to the other side without their baggage ending up in Davy Jones' locker....Not the passengers on the Titanic, of course...Recently I've been tossing some of my baggage overboard myself...Too much effort for a lot of things I no longer need..j