I currently have a JL w7 13.5 love it and have had DD,FI,AQ/SQ,Alpine T-R and others and nothing sounds as good or clean as the JL. Sure it cost a bit but you get what you pay for and more then anything have a good custom box make for optimum performance. This one sub is louder and moves more air then 2 FI BL 12s or a FL BL 18 I had. As for SPL come on people JL is known for quality/sound quality not a SPL/burp sub, though they can get very loud but also sound good doing it once again depends on the box. If you can't or know how to build a proper box stick to JL specs. Mine in in a 4th order bandpass and goes from 30Hz at the -3db F3 point to 90Hz and has a sensitivity rating of +17db is all about the box.
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