direct-fit sound system package bolts in to 2007-2013 GMC Sierra or Chevy Silverado crew cab trucks. Front 2-way speaker set: 6.5″ door woofer, 1″ pod-mounted silk dome tweeter for optimum imaging/staging. Read: 6.5″ coaxial speaker. Subwoofer: zero-space subwoofer and GM truck-specific enclosure. 5-channel v-power system amplifier provides a clean 40W x 4 + 150W x 1RMS System Power. All factory speaker location mounting adapters included. Vehicle specific wiring harness included. Model Number PSS-21GM.