I recently bought a Fender Marcus Miller Jazz Bass and am now looking to buy a new amp. I have borrowed a Ashdown Mag300 for rehearsals and just CANNOT get a decent sound. i use fingers and play quite heavily and the only half decent sound i can get is with no treble on the bass and a less than flat EQ. Top end sounds ok but anything deep is rattling the hell out of speakers and especially the tweeter. Any advice on why this may be happening and on amps/combos that may suit the MMjazz around the £500/£600 range would be much appreciated.