Soundstream STL4.500 4-Channel A/B Amplifier (Black) RMS Power Rating: 4 ohms: 80 watts x 4 chan., 2 ohms: 125 watts x 4 chan., Bridged, 4 ohms: 250 watts x 2 chan. Full MOSFET Power Supply Double side PCB and SMD components 4-Channel operation Black anodized finish w/ chrome accents