SDX-100.4 - Sundown Audio 4-Channel 620W RMS Micro Amplifier Specifications: 4 Channel Class D Amplifier 4 x 100W @ 4 Ohm 4 x 155W @ 2 Ohm Bridge 4 Ohm: 310W x 2 Ch S/N: >92dB Highpass / Lowpass Filter / Bandpass Filter Gain Adjustment Suitable for vehicles with Start/Stop Function Cast Aluminum Heat Sync Dimensions in Inch (L x W x H): 8.89inch x 6.06inch x 2.08inch Water Resistant Note: Unscrew the badge using an allen key to access audio settings.