A gentleman named Bill Fitzmaurice has been evolving a new approach to horn speakers, for sound reinforcement and for backline use. He has documented their development in audioXpress magazine over the past several years. They are not yet commercially available, but may soon be marketed under a "Delta" brand. I recently bought two of his prototypes, one with a Carvin 10" in it and one slightly larger with a EV-12L. These are nice cabs. They are very sensitive, as you would expect with horns, at about 103dB from 125Hz on up. The response curve falls off pretty fast below 125Hz, but with some EQ they sound good with a 5 string anyway. They are also relatively small and light. The 10" DR-10a is basically a cube about 21" square, weighs under 45 lbs and fits in the back seat of my Honda Civic. The 12" DR-12a is about 24" square, and won't fit in the Civic, but still only weighs about 60 lbs. I used the DR-10a on a mid-sized-club gig last weekend, sitting it on top of an Epifani T-112. This was a great sounding rig, since the Epifani filled in the bottom octave or two nicely. I am sure that I could have used the DR-10a alone and it would have been loud enough, but I was after a big-round-yet-clear sound rather than a particularly loud sound, if you know what I mean, and was very happy. I can't figure what I'll use the DR-12a for, except maybe outdoors. Bill has also developed a horn subwoofer, another 24" cube, that will soon be published, and that I await eagerly. There is no information that I know of on the web regarding Bill's speakers, since the information is all in audioXpress and copyrighted there. Back issues of audioXpress are available on CDROM at reasonable cost. See www.audioxpress.com If you are a do-it-yourself speaker builder, the articles are very complete, although building a horn is a little more complicated than a simple box. The speakers are very light for the amount of sound they put out. Bill also has an updated version of the DR-10a, called the DR250, that uses a neo woofer and weighs a few pounds less.