Ive pretty much decided to get 2 12 type R's for my car and the AQ 1200D. Now i was going to get one sub for now and then another one later. I know that if i get 2 of them the 600wrms to each that amp puts out would be fine daily, but what about the 870wrms at 2 ohms to one sub? Could I just set the gain so it puts somewhere around 600rms and leave it there till i get my second one, or would that not work?