Ya knowing how many voice coils is good too.... it doesn't matter what the subs impedance is really. It all comes down to whether or not the amp makes the most power at 1ohm or not.... most of your lower end amps will not be rated for 1ohm. Only higher end/ comp amps will be. So to answer your question you can run a 1ohm sub on any amp... it just won't make as much power then if you run it with a 1ohm amp.. make sense?
Oh damn I just saw that you said you already have a 2ohm sub... you neverwant to run two different impedance subs together. Or two subs with different voice coils...basically you want the exact same sub as the other if you are going to run two.
