I have 6 ohm nominal KEF Q300 speakers and I use the 4 Ohm taps of my Jolida JD-502P amp. I found the bass to be slightly louder and tighter vs. the 8 ohm tap of the Jolida. I figure the KEF Q300s may dip below 6 Ohms so I might as well play it safe and use the 4 Ohm tap just in case.
