Boost the performance of your car's audio system, with the Boss CE404, a 4-channel car amplifier. The 50 watts x 4 (at 4 ohms) RMS power of this Boss car amplifier ensures you enjoy a loud and clear output. With a total harmonic distortion of 0.01 percent, the Boss CE404 accurately amplifies the signal for an impeccably precise sound. The 90 dB signal-to-noise ratio of this 4-channel car amplifier eliminates the background noise, so that you enjoy uncolored audio. With a frequency response of 12-22,000 Hz, this Boss car amplifier accurately reproduces sharp highs and smooth lows.