Well, I discovered something very interesting... When I tested my 1-18 cab today to see if it was 4 or 8 ohm, it came in at 6.9-7.0 with a multimeter. So I figured that I can daisy this with my 8 ohm Eden. Out of curiosity, I tested the 8 ohm Eden. It tested 5.6 Ohms!!! I wonder what the 4 ohm model tests at. Maybe that's why they are so efficient!!--You know 106db... Anyway so now if you add these together it's around 12.6 then the imp is around = 2.8?. Or if I run both 4-10s 2.5?, So the amp should be run out of the 2 ohm tap (less or equal to the speaker load), to be safe, instead of the 4 ohm tap. I normally would have used the 4 tap because the speakers are knowb as 8 ohm cabs. Am I all wet here?? Or do I have something??