I used a Visaton FR7 for this. I had an FR7 in a small bought box in P III beforehand, the sound from the homemade is so much better the depth of sound is vastly improved and its alot louder. I think this must be the size of the box that helps. The speaker is glued and screwd i then stuffed it full with cotton wool and most importantly made sure there were no gaps. It seems to work a treat. The good thing about making your own is that you can make the box as large as your space allows.

Jake