Klipsch subwoofer

I bought a used KSW-12 sub from ebay (sorry, nothing on audiogon at the time). When it was delivered and I opened the box, it was actually a KSW-150. It is in good condition, and works well. Slight rattle that I have to track down if I keep it. I have my own opinion on this, but assuming I paid a fair price for a KSW-12, is the KSW-150 a step up or a step down? I mostly listen to music, including jazz and rock, but there is an occasional movie.