Model: DX Series Power Amplifier The D series of low-noise high efficiency power amplifiers feature hand-selected components and a state-of-the-art circuit design.FEATURESStereo parallel or bridge mode operationDC protection overload protection short circuit protection thermal protection and IC protection circuits.Efficient heat dissipation in a common working temperature range for 8 ohm or 4 ohm loads.Carefully tested electronic components following state of the art circuit design for perfect sound quality.Low noise and a super efficient toroidal transformer.   MODELDX400DX600Stereo power 8Ω425W×2625W×2Stereo power 4Ω700W×2975W×2Bridge power 8Ω1350W1650WFrequency response(@1W)THD(rated output power)≤0.05%≤0.05%Damping factor (1kHz 8Ω )﹥300﹥200S/N ratio (A weighted)﹥96dB﹥96dBInput sensitivity0.775V0.775VInput impedance20KΩ (balance)/10KΩ (unbalance)ProtectionLimit/thermal/DC/short circuitVoltageAC-180V-240V, (50Hz-60Hz)Dimension ((W×D×H)mm345×483×88mm345×483×88mmWeight20kg22kg