Specifications: Operating Voltage: Dual AC 22-32V Chip class heart: 1943 + 5200 Output Power: 500W Opamp Type: 2SA1302 Channel Type: Mono Size: 8.1 x 7.1 x 2.8 inches (20.5 x 18.1 x 7.1Weight: 24.3 oz (700 Packing: 1 x Power Amplifier Board