F1 ohm question

[Bjazzman]

I know this amp can't do a safe 2 ohm load. But what would the ohms be if i had a 410 in 4 ohms and added a 210 or 115 in 8ohms? Would this work with this head?

 

[Jazzman]

2.7 ohms. Not cool with the F1.

 

[Bjazzman]

thats what i thought. im content with one 410 cab. its loud as hell. just wondering though