pahZING.//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif
You would need that much clearance in front of the sub to begin with due to excursion.
I didn't think this was rocket science, but it appears to be to some people........
SS rli should handle 500 watts fine. diamond d6 also rock.