I'm about to sell my Fi Bl 12 and was looking at the SA series subs. I've never done 10's, so i was looking at doing 2 10's (of course the box will be behind the seat). I can fit up to 2.8 cubes behind the seat, but looking at about 2.3 after port and sub displacement. My current setup does a 140.0 on the dash (at 40 hz), the box is tuned to 28 hz, and it smashes the lows like no other. I'm wanting to know what would be a good box volume and port area to run 2 10's in that would get me into that range, or hopefully higher. Also, i'll be running about 1300-1400 wrms to the pair. I know there are a lot of factors that go into how loud a setup is, so i would like to tune the box to 34 hz for a good overall sound. I've had my fun with the LOWWWWSS, but i'd like it to be a little better 45 hz and up.