Not a dumbass, but with 2.5 k $ and ur own handscraft u can do a good beginner system, or do u want to competite on SPL-competitions(SPL=soundpressurelevle), or its only to
have big bass in car and shitsound out of the originalspeakers, or did u want a good sq (soundqality-system).
Tell us what u want and what is in ur car now. And than everything easy