Install the front door speaker.
Install the front door trim.
Install the rear door speaker.
Install the rear door trim.
Install the midrange speaker.
Install the speaker grille.
Install the subwoofer speaker after connecting the connector.
Install the rear package tray and rear seat assembly.
Install the external amplifier after connecting the connector.
Install the trunk right luggage side trim.
Make sure the speaker and related connectors are plugged in properly.