4 ohms , 6 ohms, or 8 ohms???


My Canton 3.2 DL reference speakers sound wonderful.
They are rated up to 600W and the cabinet states  IMPEDANCE 4 TO 8 OHMS
I am considering a new amplifier which actually has one set the resistance at 4 or 6 or 8 ohms. 
I do not understand how to make that decision:
Should I run the speaker cables from new amp to the Cantons as 4 ohms, 6 ohms , or 8 ohms?
I would really appreciate some feedback on this...is there a simple, obvious answer?
wahoo101488

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