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I have an infinity kappa perfect. Im using a 600.1 JBL. now, I bought another kappa perfect, so its shipped to me and when I get it its a damn 120.3.

Now my question is would it be ok if I run both the 120.3 and the 12.1 kappas togetrher? using the same amp, the jbl 600

Absolutely, just as long as both subs are separate. Since they are two different models, it is safest to have them in separate boxes (or in one with a divider).