The KAC-X650D is a powerful, versatile, 5-channel amp. It integrates the capabilities of a big four-channel amp AND a super-efficient Class-D mono amp meant for your subwoofer, so in most cases it's the only amp you'll need. For example, it delivers 60 watts x 4 PLUS 200 watts x 1 at 4 ohms, or 80 watts x 4 PLUS 300 x 1 at 2 ohms (14.4V). The power MOSFET switching power supply ensures effortless performance, and its Bass Management System (B.M.S.) allows precise tailoring of the bass frequencies (with a compatible head unit). Variable high-pass and low-pass electronic crossovers let you send your speakers just the signals they can most effectively reproduce. The KAC-X650D's beefy construction includes a copper-shielded EE core transformer and large secondary capacitors, and its power input terminals (large screw-type), RCA audio inputs/outputs, and speaker connectors (screw-type) are all gold-plated for corrosion resistance. The status indicator is a variable-color LED that lights in seven different colors to tell you the amp's exact operating status. Plus, you can choose any one of the seven to be the amp's Power-On color.