Alpine PWD-X5 440W Compact Powered Active Subwoofer with Built-in 4.1 Channel Amplifier
Rockford Fosgate Punch PBR400X4D - 400 Watt 4 Channel Class D Full Range Speaker Amplifier
Alpine KTP-445A Head Unit Power Pack Amplifier
Alpine KTP-445A Head Unit Power Pack Amplifier. This compact upgrade instantly boosts the power of your system. Easy to install with no additional wiring, it fits neatly behind your head unit.