I just wanted to thank Kex for talking me into making AR.com's for surrounds to match the front. I ended up building a sealed box design because they had to squeeze into a small space and hang on the wall. The guys at Madisound did a great job at helping with the box size. It ended up being 12" x 7 3/4" x 5 1/2". I could barely fit the drivers and the crossover in. I used deflex panels because the box was so small. I haven't tested them with my spl meter or anything but they sound awesome and match much better with the fronts. They are crossed over at 80hz with the sub.
I'll try to post a photo later. Thanks!