This amplifier board with FR4 board， choose a low-power high-fidelity digital amplifier chip， and then with a high-frequency low-impedance capacitors， TDK fully shielded inductors， making this deep and powerful bass amplifier board， and good flexibility. Alto honest warm， clear and bright treble. The entire board with SMD machines， infrared reflow soldering， reliable， up to 93 percent efficiency， low power consumption， heat a small， less than 35W without a heat sink.