I tried running a sub in the port side dog house. After a season I replaced it with a sub under the helm. I found the doghouse was too sealed and the bass was trapped unless I lifted the seat back to open the area up. Having the seat back up all the time got annoying really fast.

Whatever MLA recommends, it will be great advice. He is super knowledgeable with audio and won’t steer you wrong. FWIW, I went with a JL Audio 13” tucked out of site under the dash and I very happy with it. Couldn’t imagine any more bottom end. It vibrates the entire boat when I unleash it! Can’t be good for all the electrical connections and fasteners with all the vibration lol.