Before christmas i wired up my standard coupe speakers to an amp knowing i was gonna buy some new speakers. got some infinity components, fitted them in the doors, all was working fine. going round a roundabout last week there was a loud thud noise from speakers and they stopped working, they were working fine the next time i got in car though. thought it was a lose connection so checked all these yest, now amp powers up, speakers thud, light on amp turns from green to red and no sound. what could this be? ive checked all connections and cant work it out.