very close. only reason i switched was the lightweight rules changed cause this truck with these subs was untouchable for more than a full season and people were crying and making excuses why. well long story short they made a new class to put me in . which is now welterweight. the welterweight cone area is lower 4 12s was my closest match. at the time i was layed off from my job and could not spare extra cash to switch. and had to switch or forfit my place. a close friend and team mate gave me 4 zv3 12s at a untouchable price. and later zv4 came out and pretty much direct swap. at first 12s were louder but found later only on a burp. avrge was acually .4 lower and more rule changes even lower. v4 12 and zcon 15 are almost exact same results in same box zcon slightly higher over all . slightly. i would run zcon again in a min. matter fact i still have one in my other truck. ssa was a awsome company still is.