Power amplifier main performance indicators: When DC=36V, 160W+160W; RL=4ohm, THD=10%, 120W + 120 W; THD = 10%; RL = 6ohm; 100W + 100 W; THD = 10%; RL = 8ohm; Main performance index of the bluetooth module: Class2 power class; Powerful noise eliminating circuit. The effective transmission distance is 20 meters. No stop. Follow the Bluetooth V2.1 + EDR Bluetooth specification. Have A2DP, AVRCP high-quality stereo audio transmission. Powerful Kalimba DSP embedded data processor, finish all kinds of digital speech processing. Module baud rate: 115200. The difference between the CSR - BC05 and SPK - B module: BC05 bluetooth module supports V2.1 + EDR, SPK bluetooth module support V2.0 - B + EDR (2) BC05 bluetooth module quality relative to SPK - B sound quality is much better. Main performance index case: Signal input: gold-plated RCA lotus signal input; Signal output: 4 line signal output. Power supply: DC15 - more than 36V 3A diameter of 5.5 mm heart diameter is 2.5mm. Circuit board: 1.6mm thickness, glass fiber; The IOS device installation GoldenEar software use and operation, first a GoldenEar software installed on the apple devices (apple store or download and install on 91 assistant), In a computer with a ifunbox software (you can talk with the shopkeeper, want want transport), Apple devices with computer USB link, nondestructive music on the computer file transfer to the apple device GoldenEar software folder.