If you run the same amount of power to a DVC sub with the coils wired in series or parallel the outcome will be the same. The change in load presented to the amp by the driver in question was not the question. Sure with most amps you could theoretically get 4x as much power with the coils wired in series, but that wasn't the question. The question was if wiring in series or parallel has an inherrant advantage over the other, the the answer is that with the same power applied to each, no. If you don't believe me, do the math. Apply, say, 400W to a DVC 2 ohm sub with the coils wired in series or the same 400W to the same sub with the coils wired in parallel and the result is the same, 400W are going into the sub. If you were to break it down by coil the voltage drop across each coil would be the same (the amp output voltage on the 1 ohm load would be half that of the 4 ohm setup) and the current through each coil would be the same (current from the amp double on the 1 ohm as compared to the 4 ohm). There are amp out there that do exactly that, adjust rail voltage to account for driver load an thus output the same power to any load within its operational range and other than the reduced damping factor and efficiency there is no difference between wiring configurations.