installing 12 sub with dual voice coil

My original SYstems is not the greeatest but it BUMBpz

anyways i bought two 12" volfenhag subs ZX-4712DVX

and just switched the subs. it sounded weak. no thump at all.  i mean it works. but does not have that deep rolling bass. I mean its weak.

since they are dual voice coil do i have to wire it differently?

what subs did you have in previously? where they dvc?

what are your subs 4 or 2 ohm? and what is your amp stable at? 2ohm or 1ohm?

what are the model #'s of your equipment?

thanks