Last year I bought an old two cabinet tube record player from the late fifties at a thrift store for $40. I haven't looked at the amp in detail, it's some kind of weird early stereo amp, hence it had two cabinets. The cabs are real nice furniture. For speaker design, not so much. As enormous as they are, all they contained were a tweeter and an 8" woofer. The cabs didn't even have bottoms to them. I decided to make it an open back. I needed some extra wood which came from a pallet I pilfered from work. I cut a bottom and a back and some necessary mounting pieces too. The faceplate was rather complicated in the way it was made and attached, so I decided to re-use it. I cut a plug to fill the tweeter hole and had to dream up a way to cut a larger hole in the same place as the eight inch speaker without a place to put the compass to draw the hole. I figured it out though. When I finished the faceplate I put a quick coat of paint on it and mounted one of the Wharfedales that used to be in my AC30CC in it, and hooked up my Traynor YBA1A. I'll be darned if it didn't sound good. Now that I'm satisfied I'm going to take it apart and refinish the cab to make it look nice. It was a cool project.