In my 2003 W 530i I had 1 Alpine Type-X W12D4 in a Skar 32-36Hz vented Blbox wired to an Alpine V-Power 1000M Amp that kept over heating so I replaced it with an Alpine Type-X A90M Amp running to a Soundstream VRN DD7HB Headunit w/ Memphis 2 Farad Cap. The Sub Blew Apart in 3 Months. The Heat...