ok I just ordered a 15" Dayton DVC from PE. I already have an enclosure built that is 6 cubic feet and is tuned to 21hz. I also ordered a Nady XA900 power amp from www.musiciansfriend.com. The Nady amp is rated at 675wrms x 1 @ 4ohms. for both items including shipping and the materials to build the box it came up to around $375. How do you think this setup will perform? do you guys think I did good for the money? this is the largest HT sub project I have done so far so im very excited!!