the Dual will give you deeper more robust bass, and the ability to drain alot more power into it. The DVC wont more as much air as 2 SVC but it will be louder and produce more db. I have ran MTX, JL, and ADS i have a 12 ADS that i loves but i only have one and i wanted to make a custom box but decided not to do any sick system in my SS. I have heard personally JL, Orion, and ADS DVC subs and for our big cars i would suggest JL w3's for boom boom base, W6's for boom boom with cleaner sound, which isn't needed unless the sub is sitting next to you. or the ADS which is a superb sound Q sub IMO, its and older version when ADS made better products. If you want some used subs and AMPs e-mail me...i have my SPL system waiting for a good home. I could hook you up with a sub, amp and capacitor.