Hi I have a focal amp fp 1.800 it's second hand I've just fitted it and it kept goin on and off until it finally stayed off what does that mean?? Also I noticed the three fuses got blown but this was after the car was switched off then back on.then along side that is my focal fp 4.75 which was fine but then as I said after switching the car back on that also wouldn't come on but the fuses hadn't been blown on that one?