Can I wire a single DVC 2 Ohm sub to 1 Ohm?

Yes you sure can! just wire the voicecoils in a parallel configuration. positive to positive and negative to negative. this will make your subwoofer a power sucking machine! just make sure that the amplifier your using is 1ohm stable, even then make sure that the wiring to your amp is of sufficient size and properly fused and installed with a clean and secure ground. otherwise it'll be time to go shopping for new equipment!