I just got an Axis A22 2013 with stereo option 1. I am in the process of installing bow speakers, a amp, and a under helm 12" sub in a sealed box.
I didn't find much in the way of instructions on this forum so I decided to document the process and hopefully it can save someone out there a little time.
Today I installed the front bow speakers.
The side panels in the bow snap off exposing an access hole to get to the bolts behind the panels with the speakers.
The top cushion also snaps off the the axis logo comes off with the 3 screws
There are 2 7/16's bolts behind each of the panels where the bow speakers go remove them and you should be in this state
Those panels take a bit of wiggling to come off but when they do you can see it already has the cutout on the back for the 6.5" speaker. There is also a hole on the bow of the boat in the fiberglass. Mine had wire ends dangling there, but I am fairly certain those were for docking lights and not for speakers. I didn't trace them to verify this but giving the type of wire and the ends I would bet its for lighting not audio.
Now the hardest part... cutting into your nice new boat with a razor blade.
I cut it like a pizza with 8 slices leacing about 1/2 inch from the side of the cut out hole in the back. I cut from the back to see this.
After that you're pretty much done, I used the metal brackets that came with the speakers and the inner screw holes on the speakers. I didn't take a picture but the metal bracket wraps around the black plastic on back of the cushion and the screw holds it in place. You could drill out the outside holes through the back of the cushion but you would also have to drill into the fiberglass of the boat.
I ziptied the wire runs to the existing wires to keep it all tidy, I don't have my amp yet so the wires are just sitting behind the passenger side pop off panel.