re: ordering tower prep kit....unless Nautique changed things for 2016, the G23 comes prewired for four tower speakers plus lights even if you get just the base stereo. The tower prep kit gets you a very costly amplifier and associated power cable (...which you'll replace anyway). Sales guys will often say you need the tower prep kit to get the tower prewire--it's what they think, but it's not true.
Planet Nautique has multiple posts on this very issue and I confirmed it on my boat (base stereo 2015 G23).
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