Power for Shiva?

Since you have to choose DVC coil configuration first, you won't be able to try it both ways.  But these are the facts:  Doubling power will give you +3 db.  Adding 110 watts to 250 watts therefore will give you +1 1/3 decibels.  The trade-off is in the performance of the amplifier.  The rated specs are measured with a 4 ohm load, not 2 ohm.  Lowering the ohm load to increase power results in a trade-off of output quality.  There will be less damping factor among other things and the amp will get hotter.  Although subs are usually run at a 2 ohm load, in this case I don't see that it would be worth it in the long run.

Knowing this but just for fun I'm going to switch my sub to the 2 ohm version (because I already have one in a box not doing anything)... just to see if I can hear any quality differences, or obvious loudness differences.  In my case I already have two of the same sub with the different coil configurations, so a test isn't going to cost me what it would cost you.  But I'm betting beforehand that I go back to the 4 ohm load version and stay with it.  Because I bet I'll not be able to hear a difference in volume, and I'll always wonder if the sound is as good as it was before and I simply can't tell.  We have a tendency to quickly adjust to the sound we presently hear....