Paul, a bunch of those images in that gallery link you posted, are borrowed from elsewhere. I recognize some from Decware and other sources I've seen over the years. It looks like there are some of those "folded" QRD....where the deepest wells are L shaped to get the deep wells in a shallow depth.
I was never sure if that would work or not. I've had people poo-poo that design, but then we've all been wrong on acoustics points before.
