What would be the difference between the XD-10d2 and the XFL-1022? The rms wattage doubles, just curios how much of a difference? I know there will be some, but will it be an enormous gain? And then what about the HD-10 D2? And I have the amp to push all of those subs, but I need to stay dual 2ohm as to keep my amp bridged at 1ohm. Thanks