This seems like too simple of a question for those on this forum but here it goes. I have a boat with Alpine stereo and Alpine APX 450 amp. I am adding wake board tower speakers but want to be able to select between the rear speakers in the boat and the wake board speakers. it seems like there should be a simple selector switch to be able to do this, but I am not having much luck. Is there a simple switch I could use or do I need to go with a zone type system. Also some zone selectors are 100 watts per channel, do I need one that supports more if I have to go this route to match the amp??