Key Features 4 Channel Digital (Class D) Amplifier Maximum Output Power 400W 4 X 45W @ 4Ohm (Cea-2006 Standard) Rca / Speaker Level Input Signal Sensing Turn-On/Off Variable Low- & High-Pass Filter Compact Size (145 X 45 X 99Mm) Conformal Coating Protection Amplifier Features Class D Amplifier Yes Full Range Digital Amplifier Yes Load Capability 4Ω Stable Maximum Power Output 400W Rated Power Output (4Ω) 45W X 4 (4Ω) Cea-2006 Compliant Yes Low-Pass Filter Yes High-Pass Fliter Yes Switched Mode Power Supply Yes, Power Mos-Fet Signal Sensing Turn-On Yes Line In 4 Rca / Speaker Level Speaker Level Input Yes Die-Cast Aluminium Heat Sink Yes Dc Cable Supplied Yes Amplifier-Specifications Rated Power Output (Cea-2006) 45Watts Rms X 4 At 4 Ohms And 1% Thd Low-Pass Filter 50~200Hz (-12Db/Oct) High-Pass Fliter 50~200Hz (12Db/Oct) Input Impedance 10KΩ Signal To Noise Ratio 98Db Signal To Noise Ratio (Cea-2006) 82Dba (Reference: 1 Watt Into 4 Ohms) Frequency Response (+0Db, -3Db) 20Hz ~ 20Hz Operating Voltage 14.4V (11V ～ 16V Allowable) Maximum Current Consumption 15A Dimensions (Wxhxd) 145 X 45 X 99(Mm), Weight 0.7Kg Unit Weight In Individual Package 0.99 Kg.