I have a cabinet my dad made in college (1960's) as a subwoofer. It used to be powered by a 12 watt tube amplifier through a crossover from the stereo outs of his record player. Everything but the cabinet has long since left my possession. The cabinet holds 9" speaker attached to a baffle that was added to cover a 12" hole. It has an adjustable port on the front at the top. The dimensions are 35.5 x 27.5 x 16.5 inches. The material is 3/4 inch plywood and a piece of partical board to hold the smaller speaker. Interior is 26" wide. I have long been planning something to do with it, but too scared to start working on it for sentimental reasons (Dad died when I was 6). Now its taking up space and I have an up coming gig and I need an extension speaker for added bass for several dropped tuning songs. So this will be it in the temporary. Picture the added baffle piece removed and a G12 in the 12" hole. I'll let you know how it sounds. For the long term I'm thinking either an oversized 2x12 or 1x15 JBL E-130 if I can ever get my hands on one. My TRII has 2 E-120s that I think would sound splendid sitting on top of that cabinet with the E-130! What would you do? Here it is upside down which will be its new right side up. You can see the 12" hole that the extra baffle piece covers.