I've got my my LAB horn subwoofer almost finished minus flare extensions and paint/finishing. here is a page with some construction pics on it. http://www.globalms.com/horn.htm I will add measurement graph as soon as I get a chance to make them properly. Construction of this box was more time consumer than I had originally thought it was going to be, but expect for a few pieces I had to trim to make fit right it went pretty smoothly. Right now I'm powering it with two PE 250W subwoofer plate amps. Which I think are rated at 350W into 4 ohms which is what these woofers are. I got a few minutes last night to play around with it for some very informal measurements and listening. Using NCH tone generator on my computer I did a quick sine sweep test. The sub was almost in the middle of our 120'x50'x20' shop, which is the least ideal spot for a horn subwoofer. Ideally it should be fired into corner with one of its edges flush with the wall. Response seems to fall off quickly after about 30 hz. Next I threw in a CD to listen to it. I adjusted by ear to match the levels of the speakers, so I'm probably 10 db off correct calibration. But it sound good - very good. My previous subs include a sealed Titanic, Dual EBS Shiva, Sealed Tempest, bandpassed 15" DVC, and a single vented shiva. Although I have got a chance to listening to it in my home, the horn seems to have the best sound - to me. It's punchy, yet detailed and tight. Somebody in another thread describe the sound of a bass horn as "Effortless" and totally agree with the description. Naturally I'd have to see how loud it got so I put in some earplugs and take my trusty RS SPL meter, crank the volume about half way and go stand about 2 yards in front of the Horn. It seemed stuck in the 120's. Now at that volume and with ears plugs its hard to gauge distortion by ear, but the LAB horn didn't seem to be struggling. As soon as I get the Flare extensions done and get it moved in to HT at home I will be posting measurements. This probably won't happen till at least Saturday.