I recently visited the Drop ( formerly Massdrop) site and I've noticed that some of the products are shipping to Italy ( where I live), some are not.
Sennheiser HD6xx are not, while I've seen a good deal on Hifiman 4xx which can be shipped to Italy. Costs are not so much, though I have to figure out taxes for import.
Anyway my question is about impedance which is 35 ohms, so absolutely not a good mach with my Apogee Groove dac/amp, but have read somewhere that damping factor does not have any influence in planar headphones (like this 4xx). Ask you experts if this is true. Beside this I also wonder if the behavior of Apogee, which has been very well tested here, would be power-like adequate due to sensitivity 93db and Groove's power out at low impedance which - if I understand- is not that great. Too many doubts maybe about this Headphones and probably better get a Senny from Europe, but the price is inviting and it seems 4xx are a good product. Thank you so much for your advice.