Some speaker driver measurements...

I agree, this driver has very impressive measurements!


Now, go acquire and measure SB15NAC35 - it will go even better. Actually this is driver which is testing distortion of your measurement rig, rather than setup testing distortion of the driver... See 4th and 5th order going down while raising voltage to 5.6V, amazing.


Vifa (now Tymphany) NE-series is also worth checking further. NE149W shows extreme level of fidelity as well. It is still overally better driver series than over-hyped Satori.
 
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Now, go acquire and measure SB15NAC35 - it will go even better. Actually this is driver which is testing distortion of your measurement rig, rather than setup testing distortion of the driver... See 4th and 5th order going down while raising voltage to 5.6V, amazing.
I was actually going to make a comment similar to yours, except that I already picked out the SB15NBAC35-4 as my midrange for my next loudspeaker, nicknamed The five voices loudspeaker (5 drivers) :)