Boss Audio Systems PH2KD.4 is a Class D 4 Channel Car Audio Amplifier that combines a compact size with a wide array of features to suit various audio setups and preferences. With 200W RMS power output per channel into 4 Ohms and up to 1000W RMS bridged power into 4 Ohms, it delivers ample power to drive your speakers and create an immersive listening experience. The PH2KD.4 features variable low pass and high pass filters, allowing you to customize the frequency response of each channel to match your speakers and acoustic environment.