I picked this up "back in 2003 or 2004 JBL PSW-D115 it wasn't exactly heavy at 53lbs with a dimension of 20x20x22 which is huge for a home audio sub woofer??
the specs on thing is like (rms) 350 with a 15" driver, "so much for the specification"

the real reason I'm talking about this JBL PSW-D115, is its (metal grill) one would have to take a hammer to beat on this grill" to get to that woofer??!! yes I have seen quite a few toys r us (Wheels) move that monster before I retired it. I have more pics of the rear and grills off in the (photo gallery) if anyone interested. never had any issues with this sub. except for the size, and its made in Canada at that time.