No it's not a math problem, or is it? I have 3 cabs, an Ampeg 4x10, an 810E and a 1x18. The 4x10 and 18 are both 8 ohm, and the 810 is a 4 ohm. Can I run all 3 heads with my SVT-CL? I'm assuming the math would be right, 8ohms + 8 ohms on one tap would give me 4 ohms, and the 810 would run on the other tap, with the amp set to 2ohm output. I want to run all 3 at once, just for that extra oomph, and because, well, why the hell not? Will this work?