Hi, I'm an ice Newbie. I've bought a car which has x2 JBL P452 (4" 2-way 45w), x2 JBL p552 (5.25" 2-way 50w), x2 JBL tweeters, x2 factory tweeters and 10" JBL sub (this is being run from a 2 channel VIBE blackbox II already in the car). Basically I want a not so expensive 4 channel amp to run the midranges +/- the tweeters, until I upgrade the whole system. My price range is £160 max. I was thinking about the JBL GT0 4000 - any comments/suggestions? Headunit will be changed soon to MP3/CD player (not sure which) so can't give spec for this.