I bought 2 12" SR DVC, i wanted to go 2 12's in my trunk but wanted to test out how 1 12" ported will sound, and it sounded amazing, i have the PA1200.1 monoblock amp, the swtich on the amp for the +8db was on and i listen to music which has alot of bass and gain is about 75-85% the box is perfectly built to spec on the polks website. the first sub i played 2 weeks slowly and i started smell smoke and burnt the voice coil, the 2nd sub i played for 4 weeks!!! slowly before i cranked it up and again there was smoke comin out from the back. i got them both warrantied, my installer called polk and polk sayin to turn off the +8db switch off if your listenin to music with bass already in it. then why even have that switch?? does anyone know why this has been happening?? is it the amp??? someone please help srry for the long post.