Youll be better of getting one amp for all of them, they, I think take 150 each??... So get a 600 Watt amp, not 4 150 watt amps. Its just the better choice.
Each sub handles 375 with the C.H.I.L. pack,
250 without, The Pro20 250 will put out just enough to keep me at the lowest max level. Since I'm gonna run the C.H.I.L. pack anyway, I'm going to get the amps that the pack works with.
Nice install but I know for a fact you dont have enough air space in the cabinet for 4-10's mine is 3-10's same idea and im just barely getting enough air space in plus my box is bigger in general it comes up higher to the window. Do you notice an effect???
Nice clean install. Sorry gotta take one point for the air thing. Great job though.