My friend and me have tested both designs and both have there merits. My problem was they were only tested for home audio not in a car or truck. The DB has the most uses as far as a good HT sub, low frequency help with L/C/R (HT), and I am sure it is an excellent sub for automotive use. The wedge on the other hand seems to have limitations as far application leaning toward only automotive use. We used a piece 3/4 mdf fasten to the bottom to take advantage of the wedge design. It is a very good design hits hard a plays fairly low. Of course we tested with the HT set up and was pleased with the results. The DB is my favorite for all around use but if I was you I would still build the wedge just to see the difference for yourself. Good Luck.

HT-EXT

wedge uses 2 subs db uses 1, youd have to compare the wedge to 2 x dbs. wedge loads the vehicle (excellent tactile experience), db does not. ive used both, wedge is better for sq applications db better for spl. both excellent. imho