As a fairly inexperienced stereo person who purchased a used boat that was already loaded with a IMHO very good sound system I was wondering what it would take to install a WS-420. Do the interior speakers need to be amped to be controlled through the eq or is there another way to control them through the eq or just something I donít understand with how the ws420 all works. I know you can control the boat and tower speakers separately however, can you still control the volume normally or should you only use the eq to control the volume once installed? Any explanation would be appreciated.