As long as both of the subs are plugged in and working ok (not topping out or farting) u shud b ok, check the frequency range and gain level, u might have knocked them when putting it back in!
However, by reading ur thread i see that ur using the wrong type of amp for ur subs anyway, u shud have a monoblock amp (1 channel digital) and run ur subs in parallel (take the positive and negative from the amp, go to one sub and then directly from that sub to the next) this way you'll also be getting a lower ohms level, which means more power (2ohms in your case) instead of the 4ohms each sub ur running now!! also wot power are each sub (rms) and is your amp 600w total power or rms?? (i'm guessing total!)
so next time you pump it up he wont have a chance!!!
U know da deal u gotta keep it real, otherwise u'll look a fool
and that defo not kool. laters Ste