Power up your in-car sound with the XM-S400D stereo amplifier. Each of the amplifier^s 4 channels deliver 100 W of dynamic audio, while low and high pass filters separate the frequency range to ensure a more accurate sound stage. The speaker-level input makes installation easy, even with integrated head units. Class-D amplification technology for high power 100 W x 4 maximum power output Low and high pass filters for accurate sound Speaker-level inputs with power-sensing for simple installation Overload protection circuit and speaker-level input CHANNEL CONFIGURATION 4ch MAX. CHANNEL POWER CONFIGURATION AT 4 OHM 100 W x 4 FREQUENCY RESPONSE 20-20 kHz WEIGHT 0.46 kg