3 boxes off a 1200s

[Glenn]

I just bought a new 1200s (sounds awesome!) and am running 3 boxes from it: 2 x 15 @ 400W each, and one 4 x 10 with a horn @ 500W. Each is 8ohms.
However, I was told by a guy that I should not run an odd number of boxes off the amp as that would "throw it out of balance". Now, I don't believe this as it is a mono amp and the comination of boxes does not go below the minumum impedence of 2ohms, so I think it will be fine, but can anyone think of a good reason for not running this setup?

Thanks, Glenn.

[slade]

well if im right that would depend on how the cabs are run, parallel or series, and how the output on the head is set up to run.

[rumblethump]

out of balance??  FOTFL As long as your amp will run 2 ohms with no problems, 2.67 ohms will be ok.  I'd check on the amp temp after prolonged use though.  Get a fan for it if it starts to overheat.  What might throw it out of balance would be if the cabinets are rated different ohms.  A 4 ohm cabinet gets twice the power an 8 ohm cabinet gets when hooked together.