none of the above..........seriously
I agree with you that 4 listed speaker may not be suitable for low powered SET amplifier.
I think Tekton Design Speakers are also power hungry with many drivers.
Their specified efficiency are likely to be exaggerated too.
Thus they may not be suitable for low powered SET amplifier either.
Tekton Design Impact Monitor’s frequency response in the farfield, and an Earthworks QTC-40 for the nearfield responses. My estimate of the Impact’s sensitivity was 87.5dB(B)/2.83V/m, considerably lower than the specified 94dB. (Speakers with true sensitivities greater than 90dB tend to be rare and expensive.)
Read more at https://www.stereophile.com/content/tekton-design-impact-monitor-loudspeaker-measurements#k5gt1FV6ml...