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Wow! Sennheiser HD 540 Reference are so good. | Page 237 | Headphone Reviews and Discussion - Head-Fi.org
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HD520 II Speaker-P Sennheiser Electronic Labor W; Wennebostel, build | Radiomuseum
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I found these Sennheiser hd 520 IIs at a recycling center and I can't find much information on them. Anyone know anything? : r/headphones
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Wow! Sennheiser HD 540 Reference are so good. | Page 217 | Headphone Reviews and Discussion - Head-Fi.org
