hey guys. i'm new to this electronics stuff and i'm getting ready to upgrade my sound system. could anyone let me know if the following combinations are compatible and if anything is over/underpowered:

alpine CDA-9885 + alpine PDX-4.150 + infinity kappa perfect 6.1's

or

pioneer DEH-P6900UB + alpine PDX-4.150 + infinity kappa perfect 6.1's

also, does anyone know the pre-out voltage of the alpine HU and the input range of the amp? from what i've learned the output voltage of the HU should fall within the input range (gain, right?) of the amp for maximum signal transfer.