I can't find an optimum box for this woofer. I can see why it is $10. With 3mm of excursion, goes well past its mechanical limits with 65w of power even at 100hz. To increase the mechanical power handling, I modeled it in a .5 cf box and it doesn't get much better. The Qtc is 1.3 and that's...
Getting the correct sized box is only a small part of making an accurate speaker. http://www.speakerbuilder.net/web_files/Articles/xover%20article/xpointmain.htm http://www.speakerbuilder.net/web_files/Articles/phat/hpif.htm If you want to find the optimum sized box, download Unibox.