I like the diamond stuff too! Not too sure on a boat , the voice coils are open and that is not good in a damp eoviornment. I have used polk in the past but they are prone to blowing the tweets. Clarion separates are bullet proof and sealed for marine.I have 2 sets in the cockpit . Kicker just released their new marine stuff and it is hot! All sealed v/c and spyders on the woofers. Grilles are attached to the speaker basket. The kicker woofers are totally different than last years and they have a cool enclosure too.