I have a civic and got 2 12s running this guy i know has 1 10 i think or 12 kenwood typhoone subs and that shiz rocks the car so just wondering if echo's and stuff have anything to do with that?
also, what sub are u running, and what enclosures do both of you have. If he has a better amp and a ported enclosure built to spec, and you have some cheap 12s, amp, and pre fab box, then yeah, id expect his to be louder, even if it is just one 10.