I truly understand the idea of wanting a drop in box, but a custom made box shouldn't be all that costly if you don't want to build it yourself.

With these guys and a couple of online calculators, it is pretty easy to size. I did it for my 12" JL W6 and it sounds awesome along with ten 6.5" speakers - six in-boats and four tower mounted. They aren't the highest end speakers, but with the proper sub and enclosure it is an awesome sounding system.

My next boat I went with two 12" W6s and Wetsounds speakers and I used the same calculators. I guess my point is, if you are going to go with a decent or a great sub, go ahead and spend the time/money to build the enclosure correctly. It does make a difference, and you can also save some room down by your feet.

I figure if I can do it, anyone can! I still get a lot of compliments on my first enclosure.