I had an SPL 12 inch sub in my truck. It enclosed in a down firing box with 1.65 cubic feet of air space. I am powering it with an Alpine M301. I have blown this sub three times now with this setup and i'm not sure if this sub is right for my setup. I got the sub for free but now i've used up all my free returns, do you guys have any suggestions to what i should replace it with. I need something that will handle 350 watts rms and work nicely with about 1.65 cubic feet of air space.