I had my JVC unit working ok with the front stock speakers. I only have front door speakers and i replaced these with some kenwood KFC-1389ie speakers (38w rms 150w max). The amp inside my headunit blew. The headunits power rating is (19w rms 50w max). The rms is exactly half that of the speakers, is this why the amp blew? because the speakers were asking too much power from it? I am planning on getting the same kenwood speakers again for the back. If im doing this should i get a 4 channel amp? Would a JBL GTO-4000 amp (4 x 50w rms, 4 x 100w max) do? If so i'll go ahead and buy it.