I am installing a sound system on a 2004 Polaris Ranger 4x4. So far I have a sony head unit, Lanzar HTG 2400 2 channel amp. powering 2 electrovoice evid 6.2-8ohm speakers mounted on roll bar overhead.I added 1 large deep cycle marine battery. I still have enough room under the hood for 1 smaller amp. I am thinking about buying the Lanzar opti sl800D amp to power 2 10" subwoofeers mounted in a sealed plexiglass enclosure between the evid 6.2s on the roll bar. I am not sure what subwoofers to buy. They need to be somewhat weather proof and have very good sq and decent spl. Any suggestions?