actually she has jbl 5.25" speakers in the front and some cheap blaupunkt 5x7"s in the deck. btw, this is in a dodge shadow, and its a hatchback. dunno if that helps u. thanx for the suggestions but i was going to look for a decent sub that already has a box with it cuz then i wouldn't havta make a box; but i will if it will yeild better results.