The RF website has a decent wiring wizard, put in the details and you get what and how to wire it all up. JL have one as well.
For 2x DVC2ohm you can go 0.5/2/8 by wiring parallel, parallel / series, parallel / series, series (voice coils, subwoofers). Though you wouldn't wire 2 subs in series together, as you can get some negative feedback in the subs, so effectively you can wire to 0.5 or 2ohms.