I have a Lanzar OPTIdrive 500.2 amp and a Fosgate HX2 12" DVC 4ohm sub. The amp is rated at 250rms x 2 @4ohms, 450 x 2 @2ohms, or 900 x 1 @ 4ohms bridged. So it looks like my only option is to run it 4ohms stereo, this sounds pretty good considering the sub is rated at 500 rms. Can anyone see...