Nominal Impedence and Amp Taps

Yes, in most instances. But if your speakers have unusually large impedance swings (like some esl's do) you can try the other taps and determine what sounds best to you. My speakers have a nominal load of 5ohms with swings from 1.5 to 32 ohms. The 4 ohm taps on my amp sound better than 8 ohms. Wish I had 2 ohm taps like you just to hear any difference.

Many speakers do not have uniform impedance across the full audio spectrum. The nominal value is just an average. You may have to experiment for the best sound. What is your equipment... tube/solid state, electrostats/panels, etc.? I would start at 8 ohms and work down. If the sound is lifeless, or conversely, out of control, you have the wrong setting

thanks for the help so far, my amps are Sonic Frontiers Power 3's and the speakers are Duntech Black Knights (Dunleavy). The amps came to me in 8 ohm mode, but until today I didnt want to mess with them, today they went into 4 ohm mode. Ive tube swapped 3 days ago, so I cant tell what the differences Im hearing are from.