sub/amp wiring help

You are telling us the dcr of the sub. The single voice coil version of this sub is infact 3.1 ohm and the dvc sub is dual 4 ohm. The problem that you have is with the amp. It is not designed and engineered to handle the load presented by three subs in mono, which I presume is how you have them amp running, It is blowing fuses as it is protecting itself, as impedance drops, current draw goes up, if you continue on this path you will cause failure of the amp. You amp can safely run two of your subs in a series / parallel circuit. If you are intent on running all 3 of these subs   you will need an amp that is capable of doing it properly and a box that will handle all that thes monsters can dish out.Top Secret, I can tell you but then my wife will kill me.

ps: Thiele small parameter puts each vc at 3.1 ohm/coil Wanted: More help than most