High quality filter power supply. The four pins of rectifier respectively in parallel connect with decoupling capacitor, which can effectively the high frequency interference of AC power grid. Now the clutter interference of power grid is very small and the voltage is quite stable. So the item has better performance.The chip has high conversion e and strong drive ability. The frequency band is wide and noise is very small.,Specifications:,Working Voltage: AC double 12-18V,tune type: Low/Middle/High Pitch/Volume,Channel: Double channel,Audio Input: sockets,Audio Output: 3P terminal,Input Voltage: 3P terminal,Size: 105 mm x 54 mm,Weight: 75g,Package includes:,1 x HIFI Preamplifier Control Board Module,Note:,1, Please allow 1-3 mm error due to manual measurement. Thanks for your understanding.,2, Monitors are not calib ed same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard