I made an MDF box and coated it in resin. It sounds great and the lady's love the seat behind the captain now

(Did I MentionI'm happily single?) The install came out super clean, but taking a rotary cutter to the bench is a little unnerving as it looked like a really expensive piece to replace. Not to mention the sub was wider that I though from the mounting template when I mounted it. I created a seal with foam tape between the box and the back of the fiberglass. Here's the pics:



To answer your question, "If I were to do it again, would have..." I would have done it exactly the same. The location looks factory, it sounds great, and it just fits. I lose a little under seat storage, but there is plenty of storage on the boat. The seat has some vibration to it was well, which is cool. It doesn't make any rattles, and if you don't mind working a little harder to make it look trick, this is the only way to go.