I made a pair of little scoops very similar with 10"s. Scaled it down from the eminence scoop plans, but I modified a few things that in hindsight were probably better left alone. See my avatar. It works pretty well in its range, which was decent for a kick. Cuts off at about 62Hz and goes pretty well up to 230hz. Couple of resonating bumps at 90hz and 150 hz but easily fixed with a little subtractive eq. Above 230 hz it gets freq resp is kinda messy. Definitely not a sub, but was a fun project. Would be particularly useful if I had 4, alas... don't love it enough to make more. Mostly it was an experiment to see if I could pull off the folded build.