I thought the PB12 had five (5) years until I read the warranty packaged with my new PB12 Subwoofer (same goes for the PB10). The case and Loudspeaker (the speaker itself) are warranted for 5 years but the electronics (AMPLIFIER) was limited to one (1) year. Those that own th JBL PB12/PB10 take a look at your warranty. Does yours limit the warranty on the amplifier to 1 year? Link to PB12 Specification details: http://www.jbl.com/home/products/pro...PB12&SerId=PBS This information in the link above states, if you look at the dimensions, that there is a HEAT SINK. Now my unit does not have one that I can see so Either I just got an early model or the heat sink is inside. Does your PB12/PB10 have a heat sink? If it does is it inside (you peeked) or outside the case?