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These open-back headphones have buttery bass, but they face stiff competition from their cheaper siblings.
Sennheiser HD 660S2 - Reviews Headphone Reviews and Discussion
Sennheiser HD 660S2 Review
Sennheiser HD 660S2 Review: Heavenly low end, premium price
Sennheiser HD 660S2 Open-back Headphones Reviews
Sennheiser HD 660S2 Review: Heavenly low end, premium price
Sennheiser HD 660S2 Review: A New Reference For Headphone Fans - HIFI Trends
Sennheiser HD 660S2 vs. HD 660S Headphone Comparison & Review - Moon Audio
Sennheiser HD 660S2 Review
Sennheiser HD 660S2 Review
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