Sennheiser HD 660S2 headphones offer more high-end low end

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

Circumaural Open-back Headphones with 300-ohm Impedance and 8Hz-41.5kHz Frequency Response

Sennheiser HD 660S2 Open-back Headphones

Sennheiser HD 660S2 Review

Sennheiser HD 660S2 review: I'm an open-back believer

Sennheiser HD 660S2 - Reviews Headphone Reviews and Discussion

Sennheiser HD 660S2 - Reviews Headphone Reviews and Discussion

Sennheiser HD 660S2 review: New approach yields stellar results

Sennheiser HD 660S2 Review

Sennheiser HD 660S2 review: I'm an open-back believer