105dB (1KHz) ; 80dB (20KHz). Input: XLR female, TRS (1/4 inch) output binding post and Speaker socket. Signal indication, protection indication, overheat. 8 ohms 450Watts 4 ohms 800Watts. XP3250 Professional High Quality Class H Amp DJ Stage Performance 850W2 High Power Amplifier. Two-channel professional analog power amplifier Class H Rated power (RMS) 8 ohms: 350wx2 4 ohms: 650wx2 High stability, pre-heat soft protection, stereo, bridge, parallel mode Standard 2U structure Each channel can drive a 15-inch or smaller speaker Power output interface NL4FC, speaker terminal Input/association interface XLR pure copper toroidal transformer, AC input voltage: AC230V50-60Hz.