Type electrostatic headphones, open
The sound is cider, full of dtails in the high, fluid, with low descending trs low (<20Hz) while remaining prcises ...
Compared to the headphones is a rgal ED, but also a shock to those who do not connate such costs. And once you got there trs trs is hard to do without!
I pay 100 euros used (with adapter SRD-6) and I would do without hsiter this choice, excellent value for Q / P So.
The MODEL silent between the end of Stax in 1968. I dare not even imagine the sound of a "small" SR-303 Omega II or (8 times and 35 times the price for cons).
I put my 9 because of its comfort relative.