I am adding a WS-420 and want to add a sub as well. I don't want to get into building a custom enclosure and don't need to rattle the tower off the boat, just add some good bass definition. I am thinking of ordering an Infinity Basslink powered sub. The reviews on line are really good, but I don't know anyone who has used one. The dealer where I bought the boat recommended it as an easy solution as well. Anyone heard the Infinity Basslink? Worth $200 bucks? J