inputs.text: slightly disappointed - purchased older one boat directly plug plays alpine deckwhen recieved found wired seperately like traditional amp pain truck took old unit kt445 boat installed truck plug inline alpine deck installed unit boat easier acces wiring initially contacted company asked could give unit kt445 vs kt445u told alpine not make anymore not know true decided keep unit make workthe good unit built cross overs front rear channels well seperate gain controls older plug play style not old unit hilow two position gain switchthis also rca inputs means better sound signal amp use oppposed using high input wiresso better options older one expecting able plug not pull another power ground amp turn wireas far performance not expect way louder stock deck power 45 watts however sound little louder much clearer no distortion higher volumes