I did a pretty stupid move the other day and I bought the SWR-1222D. I only have one and the Alpine M605. I thought I would be able to run the 1222D at 2 ohms but I cant its either 1 or 4 ohms. Is there a way to run the sub on a single voice coil at 2 oms or would I have to get the SWR-1242D...