Marine Stereo systems from Infinity Marine Stereo, JBL Marine Stereo Systems, Jensen Marine Stereo, Poly-Planar Marine Stereo, Prospec Marine Speakers, and XACT. Marine stereos and marine stereo speakers differ from home and auto systems in that they are made out of materials that are corrosion and water resistant. Using inferior materials on your boat will only mean you have to replace them after a couple of uses.