What was found
PILOT NOTICED SMOKE AND FIRE IN CABIN DURING CLIMBOUT. PILOT DECLARED EMERGENCY, SHUT OFF ALL ELECTRIC POWER AND LANDED AIRCRAFT, WITHOUT FURTHER INCIDENT, NO PASSENGERS ON BOARD. FOUND PASSENGER ENTERTAINMENT SPEAKER LOCATED RIGHT SIDE PAX CABIN AT STATION 209, BURNED OUT. FIRE DAMAGE TO SURROUNDING INTERIOR PANEL FABRIC APPROX 12 SQ INCHES AND ADJACENT PAX SEAT CUSHION. FOUND NO CIRCUIT PROTECTION DEVICES TRIPPED. FOUND 24 VOLTS TO ONE SIDE OF DAMAGED SPEAKER. INSPECTED ENTIRE CIRCUIT WIRING , NO DEFECTS FOUND. ALL OTHER AIRCRAFT ELECTRIC SYSTEMS FUNCTION CHECK, OK. FAILURE OF THE SPEAKER AMP TO ALLOW 24 VOLTS TO SPEAKERS ALL EQUIPMENT HAS BEEN REMOVED AND WILL BE SENT TO MANUFACTURER FOR EVALUATION.