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Sennheiser HD 660 S Audiophile Headphone, Sealed Box, Brand New, never, never opened Photo #1793621 - US Audio Mart
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Sennheiser HD 660 s Apogee, Portable Headphones, Apogee Groove Amplifier – Sennheiser India Online Store
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Sennheiser on Twitter: ""The Sennheiser HD 660 S are comfortable, have a great soundstage and a non-fatiguing combination of clarity and rich tone." @TrustedReviews rates the Sennheiser HD 660 S a 4.5/5
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