replacing stock tape deck with mb quart nra marine head ,6.5 6200 jbl marine speaker for replacing factory side, and polk momo mmc 690 for moveable as needed ."regular runabout boat" looking for a good enclosure poss even 6x9 wake tower enclosure or something that will preserve sound quality and look cooler than carpeted speaker box. also considering an amp not trying to blast the whole lake jus want clean and loud enough to be happy. difference between 2channel and 4 ch amp? kind of a newbie thanks for any advice