Ok. That's good.
I have chosen the Behringer inuke 3000DSP for the subwoofer amp. That gives 1500 W per channel (x 2) into 2 ohms. My two 4 ohm 18" per manifold in parallel give 2 ohms with a combined RMS of 1100. This looks perfect, but someone said the Behringer's give 75% of their rated power, putting it at 1125. Since more headroom is always better, and the cost between the two is minimal, should I go with the inuke 6000 DSP? This has 2 x 3100 W into 4 ohms, or 2 x 1600 W into 8 ohms.
I could wire each dual 18" in series to get 8 ohms, and 75% of 1600 is 1200. It's really not much more.
The final option would be inuke 12000 DSP (2 x 6000 W into 2 ohms or 2 x 1700 into 8 ohms). I could do either, giving me 4500 W or 1275 W at 75%, respectively.
Again, I'm not trying to blow my house down, but for an extra $100-200 I want to do the right thing for the system. I'm guessing it would be better for all the equipment to run a more powerful amp at a lower percentage of it's max. I'm sure all would work, but what would be "Best"?