Soundstream RUB4.500 500W Rubicon Series 4-Channel Class AB Car Amplifier RMS Power Rating: 4 ohms: 75 watts x 4 chan./2 ohms: 125 watts x 4 chan./Bridged, 4 ohms: 250 watts x 2 chan. MOSFET power supply Platinum 4 AWG power block LED protection indicator will be illuminated when the amp has gone into a self preservation mode Remote gain control included