I've scoured the internet, but cannot find this animal. I need/want a full-range speaker for my boat dock. The dock has a ceiling/roof so only rain blowing in and the moisture underneath are harmful. I'll remove them in the winter.

I have some older Polk (RT15i) monitors mounted, but there is little to no bass.

If I cannot find one, what driver materials will last longer than others? And, can i apply deck stain over the outside of a home speaker to prolong their life?

Budget is <$350 for the pair...used is fine.