ok just to get this straight.. both speakers are identical aside from coil configuration.. you have a mono amp? one sub is 4 ohm SVC one is 8+8 DVC? you wire the coils of the DVC sub in parallel to get 4 Ohms. wire both subs to the mono amp in parallel for a 2 Ohm load. both subs need to be the same however, so that they move together at teh same time, reproducing the same frequencies in order for the drop in load to occur.
then no you can't get two ohms. you can come close though. wire the 4+4 in parallel for a 2 Ohm load, then wire it in parallel with the 4 Ohm sub. you'll end up with about a 3 ohm load. power output from the amp will be half way between the 2 and 4 ohm RMS ratings, total.