When you want to really explore the detail and depth of your favorite tracks, the Sennheiser HD 660S2 are the perfect tool for the job.
Open-back Sennheiser HD 660S2 headphones boast wider soundstage and crisper low frequency response - Yanko Design
Sennheiser HD 660S2 Review — Headfonics
Trafomatic Audio PRIMAVERA Review – Giving Life Back to Music - Soundnews
Sennheiser HD660S2 REVIEW
Sennheiser Consumer Audio HD 660 S - HiRes Audiophile Open Back Headphone
Sennheiser HD 660S2 - Reviews Headphone Reviews and Discussion
Sennheiser HD 660S2 review - SoundGuys
What was WRONG with the original Sennheiser HD 660S? 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
Sennheiser HD 660S2 thread, Page 386
Sennheiser HD 660S2 Review Reference Sound Evolved
World Premiere Sennheiser HD 660S2 Review - The Saga Continues - Soundnews