Something that can rassue us about the headphones safety when plugged into the IESL ?

I have another question : if i connect a dynamic or planar headphone with the iESL drived byspeaker terminals, how can i adjust the AC Termination and Impedance knobs ?

Sorry, i did not understand : why to select "AC termination" on off instead on pro if i select on "bias" 580v ?

With the 200+200W + iESL and 007 is the result better or not compared to a Stax or other headphone amplifier ?

In summary is possible for you or risky to connect the iESL to a 100+100W amplifier to listen to a Stax headphone to a normal volume by adjusting of course the impedance to 96 ohms ?

Fine, same, if i set the volume to max also the loudspeakers (sensitivity 87 dB/W/m) jump in the air and the neighbors shoot me

Maybe that's not the case : from iFi PRO iESL user manual : " the amplifier rating should not exceed 100W / 8ohms rating for safe operation, or care must be taken when setting the volume. Rating below around 10W / 8ohms may not deliver satisfactory playback levels"

Ok, i would use it for a Stax Headphone with a loudspeaker amp of 100+100 W (a Mark Levinson N°27), so it is advisable to adjust the impedance on 96 ohms for safety, right ?

A question about the function : the right hand to change the impedance also works with the electrostatic headphones or just with the dinamic or planar ?