So I have a 04 Buick Rendezvous with 8 speakers (2 tweeters in front, front and rear door speakers, and 6x9's in the far back - all factory). According to Crutchfield this makes my car a Bose amplified system. So here is my dilemma; I am trying to install a JVC KW-AVX820 in-dash dvd player, and an external amp to power two 10" subs. I have