The power supply voltage DC12V-22V The maximum output power 250w The effective rate 90 Signal-to-noise ratio 100 db The total harmonic distortion 50 w 1 KHZ 24 v 4-01 30 w 1 KHZ 24 v 8-01 Frequency response range 20 hz - 20 KHZ Input impedance 30 k Speaker 4 to 8 26 db voltage gain Board Size604816mmLWH Potentiometer center distance 25 mm Weight 35 g Caution 1 The power supply voltage limit of 24V do not exceed Otherwise easily capacitance explosive slurry rectified AC voltage spikes do not exceed 25V Do not exceed the power supply voltage positive and negative do not reversed 2 Recommended power supply is 22V 5A more filtering better power supply the lower the voltage power smaller 3 The speaker recommended 40-80W speakers 4 Do not short circuit the audio output is shorted to ground or to each other 5 Please carefully check before electricity ensure the wiring is correct after only pass