I'm upgrading all the audio in my 2008 ford F-150 crewcab and I dont know what type of amp to get, I'm keeping the stock radio, I'm replacing the speakers with four 6×8 kenwood speakers with 360watts peak and 80 watts rms and they are 4ohm. I dont want to underpower my speakers, so can you please tell me what type of amp will get them to there full potential