ITEM NAME:DC 12V TDA7379 38W+38W Stereo Amplifier Board with AD828 Preamp super than L1X4 DC 12V TDA7379 38W+38W Stereo Amplifier Board with AD828 Preamp super than L1X4 Use new imported TDA7379 amplifier chip, with fever AD828 preamp. R8, R10 is the magnification setting resistor (default