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Forget wireless — Sennheiser's new HD 660S2 open-back headphones boost audiophile sound | Tom's Guide
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Sennheiser HD 660S2 review: a charming smoothness to their sound, but some flaws hold them back | What Hi-Fi?
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Amazon.com: SENNHEISER HD 660S2 - Wired Audiophile Stereo Headphones with Deep Sub Bass, Optimized Surround, Transducer Airflow, Vented Magnet System and Voice Coil – Black : Electronics
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Sennheiser HD 660S2 Open Over-Ear Headphones with Optimized Surround & Improved Transducer Airflow | World Wide Stereo
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