We have a used 2018 Mojo.

The current audio system is:
6 in cabin KM61 speakers power by a Kicker dxa 250.4
2 Rev10's on the tower and 1 JL 12w1 powered by Arc Audio xdi 850.5.
The 12w1 is in a sealed box with appropriate tolerances. It is under the helm and faced away towards the bow.

I spent about 2 hours tuning: turning up volume and adjusting gain, so distortion goes away at highest volume. I turned the bass boost to 3/4 for sub.

It sound great when the volume is halfway or at 12 on the Fusion MS-RA70N.
At lower volumes the sound is flat and I'd like more bass. Turning the system to the loudest, there is minimal distortion, but its very washed out.

I've got the hz at 80 for the sub and the rev10's. The gains are are 3/4 of the way turned up.
The 6 KM61's have the gains a 1/4 of the way turned up.

I do not have the bass boost knob, but can spend the 39.99 to buy it, if needed.

My goal is a more balanced sound with louder bass at lower volumes. We surf and ride around and tie up, so lower fuller volumes are essential. While surfing we turn it up some.

My zones are set like this:
In cabin plus sub is zone 1
Tower Speakers is zone 2.

Thanks for advice.

Jason