i just know this stock system gets louder and doesnt distort with bass better than ANY other stock system in a bmw...lexus....and to the nissan altima, its pretty nice but you would think different when you heard this setup, i would NEVER think of a stock sytem being so loud, i want to say that front doors in this xterra are like 2 stock 8's, its enough to make change rattle in the cup holder.