I was reading the topic about running 1 vc on a dvc sub, started reading on a link provided in one of the posts by Impious and it got me to thinking. I have 2 SSA Icon d1 subs and want to keep a 1 ohm load, which would be the better option for best daily output off a Sundown 1200v2? Run each vc per sub in series then parallel pairing the subs or parrellel per vc and series pairing the subs? Both subs sharing airspace in a ported box. I hope i am explaining this correctly.

There isn't much difference. Won't be noticeable at all. Though some people say that you should always wire voice coils in series and subs in parallel if possible. That's usually what I do. I think it's easier anyways.

Like KU40 said, no difference. Ideally you would want to avoid wiring the two subwoofers together in series to avoid each subwoofer from "modulating" the other, but chances are for a daily driver you won't notice any difference.