If anybody is adding or upgrading their boat speakers, take a good look at the Cantons. You can get their car audio speakers in the U.S. again and they sound phenomenal. They are a ploy cone and metal tweeter so you don't have to worry about moisture. I need to replace the MC Quarts in my boat and this is what I am going with. The MB Quarts sold in the U.S. this year are all made in China, that is why I am not going with them again. Just wanted to let everyone know of another choice!!