If your looking for the most boom for your buck go with the 2 subs, unless u want to just have a bad ass sub then go with the Bravox, If you can afford the D9.... DO IT! Amazing sub there, those things can handle what ever power u thow at them and they sound outrageous in the process!
my writting was wrong, I was thinking 2 arsenal 10s, but I think that I will stick with the D9s thanks for the help, but I might check out the brovox anyway doesn't hurt to look around.
they have it on the bravoxaudio.com website but they are a little pricie for to it would be $1000, and besides I would be underpowering them bad. Not the lower brands which are good price for me but for the EDX and the BVX. That is the same problem that I would have with the Elevation sub to otherwise I would have very much considered it.
