thinking of getting 4 Rl-i8's at about 1,500 watts between them, or would a single 15" type r do the trick? looking for SPL with some SQ, dont want it to sound like shit. but i want it to hit deep and hard -- obviously the rl-i8 is the more expensive route, but **** theyre beefy lil *****es. almost 500wrms for an 8 is amazing