As an audiophile-osis survivor, I can say that I no longer suffer from the huge expense of audio perfection. However, I cannot abide outright bad sound. The solution on sailboats has been to install high quality bookshelf speakers in the cabin inside a cabinet or on a shelf, movable to face aft towards the cockpit. They may not be "marine" but inside the cabin they do just fine for as long as I've ever owned the particular boat. Medium volumes fill the cockpit with pleasing sound.
An improvement to this is to mount very small waterproof speakers in the cockpit, to increase midrange and treble. I think this is what Tim does; I'm only expanding on it. The beauty is that if small enough you can put them in a coaming box out of the weather (mostly), and the deflection also takes out some of the harshness of mediocre speakers. When moored nobody else in the harbor\anchorage wants to hear it anyway, so the subtleness of the hidden cockpit speakers is a plus, yet it adds clarity when underway.