With your vintage tube amp which do you prefer when speakers have a 6 ohm nominal rating? I have used the 4 ohm taps on my Dynaco mark IV amps for many years. I recently substituted in a Marantz 8b and the 8 ohm taps sounded open and natural. I then switched over to the 4 ohm taps and the sound became dark with roled off top end.
