Greetings folks. I have a couple of 15" drivers at my disposal, and I have been considering a ported design. After doing some reading, I may want something a little more compact, and I am considering a passive radiator design instead. I don't know much about PR enclosure design or tuning, and was looking for a little help. Could someone out there with more PR design experience help me spec out an enclosure for the driver listed below? My goal would be good response down very low, with good output in a moderate room (11'W x 19'L x 9' H) with a 200w plate amp. Any help would be greatly appreciated! My driver specs are listed below. Piston D 0.33 M Re 3.25 Ohm Vas 9.28 Ft^3 Fs 19.0 Hz Qes 0.35 Qms 12.23 Qts 0.34 nO 0.49% Efficiency 88.9 dB Also, where is the best place to get good PRs at decent prices? I have looked at Styke, but am I missing other resources? Thanks.