Tube amps: Try the 4 ohm output tap for better sound.
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It seems that there are threads here & there in audio forums these days in which I see racist or borderline racist comments bantered about lightly. I saw a thread in our Stereophile forum, forget which thread, where Michigan Frog wrote something involving phrases like Chop Socky, phrases that are really too outdated to be racist than silly, really, but the content and tone were not so light hearted that it really was offensive to an Asian person like me (thanks for pointing that out, ncdrawl, appreciate that.)
Speakers have dips in their impedance plot, some of them severe. These dips can create attenuations at the frequencies they appear at. A tube amplifier's feedback circuit will attempt to compensate for this, but it may degrade overall sound quality. I have found that using the 4-ohm tap will help compensate for impedance dips. This only works if the speakers' nominal impedance is 8 ohms. Power output will increase with a descending seen impedance (unless speakers go below 4 ohms) much like a solid state amplifier.