resistors are a fixed impedance, subs are a reactive load.
what this means is that if you wire resistors to your amp, you will most likely see smoke.
also, there is no point in doing it. no matter what the rating on that amp says, amps barely can make twice the power at 1 ohm vs. 2 ohm.
So you would be getting less power to the subs, and alot more heat in the amp.