I would not consider a speaker with a 86 dB sensitivity and a load of 6 ohm nominal, 4 ohm minimum as a "very efficient" speaker.
I would think that you would need a powerful tube amp (100-200 wpc) to drive these speakers well, with tubes.
I am not aware of any powerful tube amps costing less than $3K, sorry.
I don't believe that a 40 wpc tube amp will do those speakers justice.
They probably work best with your NuForce amps.
I would think that you would need a powerful tube amp (100-200 wpc) to drive these speakers well, with tubes.
I am not aware of any powerful tube amps costing less than $3K, sorry.
I don't believe that a 40 wpc tube amp will do those speakers justice.
They probably work best with your NuForce amps.