I ran my hdc3 15 off of an AQ 1200 at 1/2 ohm and it got very loud. It will get pretty nasty on that 1500. Also I wouldn't worry about building the box bigger to compensate. I built at 5.1 cubes tuned to 36 hz at one point and didn't like the way it sounded. The best results I had was my last box. 4cubes tuned to 35hz. Just build the box to specs and let it rip!
WTF is wrong with people? Its the U.S. our flag comes first. If you don't like it take your ass back to mexico and fly your mexican flag all day. This should have meant expulsion for a ll students involved.
They are very nice subs. I have heard a single 18 xcon and it sounded great and I personally owned an Icon 15 and it sounded great.
http://www.soundsolutionsaudio.com/store/products/15%22-SSA-XCON-D1%7B47%7DD2.html
edit: They really excel in smaller enclosures than most 15's
You want good sound and for it to hit good I say ssa xcon. SSA makes some incredible sounding subs and they will drop very low and keep up with quick beats like a kick drum etc.
Currently running a power master 200 amp. Works great for me. Right now waiting on my irragi 300 amp and dual kit. Will be sure to post a review of the alts performance but so far customer service has been great. Dom has went above and beyond to make sure I'm taken care of.
x2 You can go to wal-mart and buy two subs, put them in a good box with clean power and make them soun great. On the other hand, you can go buy subs for $1000 bucks a piece and have a crappy install and they'll sound like crap. It's all in the box!