The Sennheiser brand is synonymous with high-quality audio products. Sennheiser Orpheus was a line of limited headphones debuting in 1991. Only 300 units were sold for $12,500 (a bit more than $20,000 in 2013). While the case for best headphones ever made is dubious, the Orpheus’ certainly are worth a listen if you can get an audio sample hearing from a pair. The firm’s engineers supposedly built them as a special project just because…

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