I asked the same question when I received my first VAC amps years ago and Kevin told me to start with the tap closest to the ohms of my speakers but after the amps are broken in, trying the other tap; it could sound better. If you are running mono amps, in balanced mode, Kevin will suggest the 8 ohm tap. If stereo, you will most likely end up on the 2 or 4 ohm tap. Which amp do did you buy.
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