funkisound
100+ Head-Fier
Here's one Chinese or Japanese website, i came across it while browsing through the HD540 thread, with pictures and data and such:
http://20cheaddatebase.web.fc2.com/sennheiser/sennheiserindex.html
http://20cheaddatebase.web.fc2.com/sennheiser/sennheiserindex.html
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