I just finished putting Dynamat inside my speaker cans. I'm hoping that it will help the sound further back and lessen the sound inside the boat. I have HLCDs but think that they are too loud for the folks in the boat when the volume is up enough for a rider to hear. I'm hoping this will help. I'll let everyone know if there is a difference.
When I pulled the speaker out, I had a lot of white powder aluminum corrosion inside the can. Is there anything you guys/gals are doing to keep the inside of the can from corroding? Even my crossover circuit board was starting to corrode. I take the speakers out for the winter but leave them up in the summer.