Subwoofer Removal/Installation

Disconnect the negative battery cable.
Remove the trunk side trim.
Remove the window defroster noise filter.
Disconnect the subwoofer connector.
Remove the lateral bracket.

Fig 1: Removing Lateral Bracket
Courtesy of MAZDA MOTORS CORP.
Remove the subwoofer.

Fig 2: Removing Subwoofer
Courtesy of MAZDA MOTORS CORP.
Remove the main bracket.

Fig 3: Removing Main Bracket
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.