pyle subs are 1000 rms, well. some of them. And also it's pyle. some people don't dig that brand.
EDIT:http://www.pyleaudio.com/itemdetail.asp?model=PLCHW15
sorry, but people who use the pyle subs say that they had to put 1000 into the sub for it to sound at it's best or near it.
the stats on the site doesn't say rms, just going off what other people say. you can find the subs on sites for around 50-75 bucks.