Well, I am about to take the Avatar plunge. I am going to pick up an SB112 and a B210 from Dave, and am mulling the 4 or 8 ohm decision. My Hartke 5000 can go 4 per side, so I am prolly ok with 2 4's. Has anyone AB'd them? Is there much diff? Will it tax my amp to run 4 on each side?