Yes, I connect through a transformer on a ferrite ring, but can be connected through a powerful resistor with a resistance of 4-8 Ohm
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Yes, I will take measurements later, but there is no special need for this. They sound perfect
Aren't they too heavy? How is their bass reproduction? Did you measure the transformer for its low frequency limit, considering such low number of turns? Do you use a specal high mu core? Have you built some comfortable ear cushions? Comfort is quite important for headphones in my opinion.
The turns are a function of the impedance. VERY low impedance is low turn count. Also fat wire. The "squeeze" is when the wire must be so thick that it will not bend to go around the core-- in EI cores we use multiple parallel strands or spend for ribbon wire. In doughnut cores the center hole can be a limit. My gut says his winding is probably fine for the purpose, especially considering he can drive it with some "power amp" which can deliver extra current if the inductance is indeed too low.
