First of all why are you running CVX's in a sealed box? If you don't have room for ported then run one of them. Also need to know what voice coil config they are. Dual 2 or dual 4 ohm? This is important because dual 2 will have a final ohm load of 2 ohm or 0.5 and dual 4 will have a final ohm load of 1 ohm or 4.