with dvc subs you either cut their impedence in half or double it depending on the wiring....a dual 2 ohm sub can be ran alone as either a 4 ohm in series of a 1 ohm in parallel....you need an amp around 1000 rms @2 ohms.....approx. for both of the subs....you need to keep the voice coils in series of course...but parallel to the amp(which means on the same channel)