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Sennheiser HE1 overview - My perception is ruined forever! @sennheiser - YouTube
The most expensive headphones in the world just got a modern makeover – and will cost $55,000
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HE 1 | Sennheiser
The world's most expensive headphones might make you consider a mortgage - CNET
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Sennheiser's Orpheus headphones cost £30,000 | WIRED UK
Sennheiser HE-1 Impressions - How does a $50,000 headphone sound? – Headphones.com
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Amazon.com: Sennheiser Consumer Audio HD 660S2 - Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil – Black : Electronics