AFTER DRIVING FOR 1 HOUR, BACK SEAT SHELF SPEAKER MADE A LOUD POPPING AND HUMMING NOISE AND EMITTED A STRONG BURNING SMELL. TRUNK OPENED AND CONFIRMED SMOKE COMING FROM REAR AMPLIFIER, STRONG SMELL OF PLASTIC MELTING AND SPEAKERS WERE TOO HOT TO TOUCH. DISCONNECTED AMPLIFIER FROM BATTERY AND TOOK VEHICLE TO DEALER WHO CONFIRMED. DEALER RE-HOOKED AMPLIFIER TO BATTERY, CONFIRMED THAT AMPLIFIER WAS INDEED SMOKING AND SPEAKERS WOULD NEED REPLACING AS WELL. VEHICLE ONLY HAS 57,750 MILES AND IS OUT OF WARRANTEE. LOCAL DEALER MAINTENANCE REPRESENTATIVE AGREED THAT A VEHICLE WITH SUCH LOW MILEAGE SHOULD NOT BE CATCHING FIRE BUT DEALER WOULD NOT COVER COST OF REPAIR.