Hi jimspov,
You'll need to try both. Any speaker has a huge impedance peak at the resonance of each driver and most have some significant dips afterward. So according to Wikipedia, that should mean its lowest dip, my experience is that Nominal should mean, "where the speaker spends most of its operating range in"....
Either way, depending on where the dips or peaks are at, Your tube amplifier will most likely sound better on one tap or the other. I suspect that you'll hear it right away. I hope this helps, Tim
You'll need to try both. Any speaker has a huge impedance peak at the resonance of each driver and most have some significant dips afterward. So according to Wikipedia, that should mean its lowest dip, my experience is that Nominal should mean, "where the speaker spends most of its operating range in"....
Either way, depending on where the dips or peaks are at, Your tube amplifier will most likely sound better on one tap or the other. I suspect that you'll hear it right away. I hope this helps, Tim