Yeah it’s wetsounds and no box, I think the 6” speakers had more bass than the sub. Maybe the stealth box would be a way to go, haven’t heard many reviews on it in a boat though.
Tuning can play a HUGE roll in perception. With that said, a full range 6.5" could never produce the bass that a 10" woofer will. I would not assume that the absence of a small enclosure means the woofer if the more ideal FA model. If you can see the back of the woofer, the model should be visible. Next, if it IS the FA, did Moomba finally make that wall a complete wall thats closed off at the top. An open top, like on past year models, also impacts the woofers performance. We've seen and addressed this a number of times in the past.