100% brand new and high qualityThe amplifier board to TDA8920BTH digital amplifier chip as the core， the chip efficiency can reach above 90%， with a small， efficient， high-power characteristics.Amplifier board can take a two-channel modes OCL or BTL bridged mono， OCL mode output 80WX2 (peak 100Wx2)， BTL mode output 160Wx1， it can easily compose 2.1 amplifier system.In the selection of elements， which by no means stingy， but not extravagant， choose the right， the right to improve the board's price.Capacitance aspects such as: red ring large current digital amplifier dedicated inductor SANYO， King Kong， Philips fever capacitance， output terminal， sealed high-quality potentiometer， original TDA8920 chip manufacturers original SMD chip devices， and so on.Select the sophisticated design， high-quality components， making it capable of long-term stability.Shipments are connected in OCL mode defaultNote: The R-channel amplifier board is inverting input and output， speaker protection in the next time， please note that the output end of the connection， R output of the RO + and L output terminal LO- is a circuit of GND (ground)， then the two lines Speaker protection GND (ground). If you mistakenly put RO- as GND (ground)， it will cause a short circuit and burn the R channel output amplifier IC， and this is the general amplifier board different places， please pay special attention.Operating voltage: �� 15V- �� 27V (recommended voltage: �� 20V- �� 25V)Maximum output: OCL = 80Wx2 (4 Euro �� 27V) peak 100Wx2 BTL = 160Wx1 (8 Euro �� 27V)Board size about: (L*W*H)12.15*8.12*3.10cm/4.78"*3.20"*1.22"The board is a good product welding test plate， connect the power， speakers， audio can be used. BTL mode when the load is recommended 6-8 in Europe， if you use 4 ohm load， we recommend that the power supply voltage �� 15V- �� 22V.Quantity:1Pc