question on 5 channel amps

[hazardous0388 10+ year member]

I've been looking at a few 5 channel amps and i would just like to know one thing. On all the ratings they have them all at the same impedance. Can you hook up The first 4 channels @ 4 ohm each and then the 5th channel @ 2 ohms? or do they all have to be the same impedance?

Thanks

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[Bake 10+ year member]

No they don't all have to be the same.