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Fullrangeman, as I went back and read the article poseidonsvoice cited, the high-impedance driver has more windings but of extremely fine wire, with a lower moving mass than a comparable low impedance driver (and apparently also has a stronger interaction with the magnetic field). I guess this makes sense. Aluminum is favored for its light weight, although Grado uses copper for all their vice coils, but that is probably a whole different conversation.
I must be missing the connection though as I don't see a typical smart phone user listening to his mp3s or AAC files with a big set of Focal Utopias on their head.
I'm a big fan of higher impedance phones based on my listening experience. The trend however, seems to be going in the opposite direction. I've seen most of the newer high-end phones have a Z below 50 Ohms. I don't get it. I've heard the argument that it's so the phones can be driven by smart phones, tablets and portable DAPs. I must be missing the connection though as I don't see a typical smart phone user listening to his mp3s or AAC files with a big set of Focal Utopias on their head.Then again, I ran across a discussion as to why Sennheiser HD-600/650s still sell so well after so many years. Nobody seemed to really know, but being biased, I think it's the Hi-Z and open-back design. Paired with an amp that has decent rails and the dynamics will take care of the rest.Of course, that's just my opinion.
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