The PA D5000.5 is Polk Audio"s new high-efficient digital 5-channel amplifier. This amplifier is perfect for providing the correct amount of power to a complete upgrade to your car audio system. With five channels this amplifier will able to amplify four speakers and a subwoofer. So if you are looking to complete upgrade your car audio system and need to supply power to your new drivers this amplifier is the solution for you. With the ability to bridge channels the amplifier will allow for multiple wiring options and power handling ratings, giving you more options with the same about of quality and efficiency.