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Boat Build Series

Mastercraft Maristar

Episode 3

Sound System Install / Length 23:14

Learn to cut out fiberglass and install a new subwoofer with head unit.

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Continuing our 2006 Mastercraft Maristar 215V build, in this video we remove the old Clarion head unit and replace it with a new Fusion MS-RA70 bluetooth marine stereo. 

We walk you through how to remove the old unit, how to wire the new head unit into the factory wiring, and how to install the new unit into the factory location with an adapter plate. 

We also install a 10” JL Audio Subwoofer in the bow walkway to ensure a cool look as well as killer sound. We walk through how to measure, cut and support the sub in the fiberglass to ensure a long lasting, strong installation. 

This 2006 Mastercraft will surf, sound, and ride like a new boat when SWELL Wakesurf is done with it! 

What you will need:


  • Power drill
  • Phillips screw driver
  • Jigsaw
  • Wire Stripper


  • Painter's tape
  • 18 gauge speaker wire, 18 guage black and white wire
  • 22-16 gauge heat shrink butt connectors
  • 16 - 12 gauge heat shrink butt connectors
  • Fusion Head Unit
  • JL Subwoofer
fresh air exhaust
liquid lumens

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