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Another mismatched ohm cab question

Did a search and did'nt see anything on this. The second guitar player in my band wants a bass cab by his. I have an Avatar 410 8 ohm and an Avitar 210 4 ohms. I run a Genz Benz 6.0 shuttle head. I told him I don't think I can run the two cabs together.Thoughts?
 
That would equal 2.6 ohms. If the head can handle down to 2 ohms (check the manual or look on-line) you are good to go. If the can head only handle down to 4 ohms, DO NOT DO IT. Also know that if the head can run at 2 ohms and you have one 8 ohm and one 4 ohm cabinet, the 4 ohm cabinet will be louder than the 8 ohm cabinet.
 
rewire the 2x10 to series, which makes it 16Ω.

that'll put most of the power into your 4x10, leaving maybe a third of it for the 2x10.

you could then do the split cab thing. (i wouldn't though, it can make for loud, messy stage volume to split stuff like that. i would however, put that 16Ω 2x10 cab on my 4x10, making a kick-butt 6x10 stack.)
 
What PA do you have? How much stage space? Why does the guitarist need more bass?

Spreading two bass cabs on stage is a recipe for complete bass mush for the audience.

4x10 and their bigger brothers have hopeless dispersion. You might solve guitarist's issue with a vertical pair of 2x10, as well as giving much more of the audience the good stuff.