Be careful with those subs, i had a pair of them and they were ran at 50 watts less than rms and the leads broke on both subs after less than a year. Sounded great until that happened though. And yes they do make 15s of those subs. Where are you getting that price for them at?
They were not being clipped and that is a known problem with the massive CWs. And apparently you dont know much about subs b/c being clipped will not cause the leads to break like they did, its just a flaw in the design. And those subs will NOT take a true 1000 watts, i ran them on a memphis MC1000D amp rated at 1100rms at one ohm (which is what the subs were wired to) and they had a hard time handling that. I used to work in a local shop that sold massive so if you choose not to listen to me then that is fine but i saw the return rate. Dont get me wrong they are great subs when they work but do not run them at much more than rms, its just not a good idea.