4 ohm or 8 ohm tap


I have a pair of AZ Adagios, they are 6 ohm speakers. Should I use the 4 or 8 ohm taps on my tube monoblocks?
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I remember reading some time ago in another forum that if you had a speaker that averaged a 6 ohm load and used an 8 ohm tap on a tube amp it would run hotter than if you used the 4 ohm tap. Is this true?