I have a 15" Q with full cooling and extra spider.... With all of that, I'm throwing roughly 1000 watts on it. As many stated, the q is a SQ sub, but that doesn't mean it can't get loud. Same with the BL, even tho it isn't a SQ sub that doesn't mean it can't get loud and sound great doing it. Every review on the BL that I've read praises its ability to get loud and how it sounds great doing it.. Judging by how much power you want to put on a single woofer, definitely save a little extra and get the BL.... you will be happier I was browsing the Fi website the other day , I think cooling is still free so you can save $40 on that still... Make sure you place it in a proper enclosure w/ enough volume and port area!