Chasing an ongoing issue. On my rear 6x9s about every 6 months one channel blows the speaker. I've now replaced the speaker 4 times. It works fine for 6 months then one day (like today) it just starts going all static and basically crap and I have to disconnect it and replace it. Just one output. The other rear speaker has not missed a beat and it's over 2 years old now. Is it the amp? My wiring? any ideas ??