Sennheiser HD 660s Audiophile Headphones - Discontinued headphone A2DC CODE 23 is designed to

CODE 23 is designed to be transformative

6mm DLC dynamic driver | 4 custom Knowles BA Sci-Fi armor design | Unique notch filter| 2nd-gen semi-open design | 3 tuning filters

the M15S will transform essentially into a desktop device and work completely without the battery

Cable structure

Superior highs extend over precise and controlled bass notes

Sennheiser HD 660s Audiophile Headphones - Discontinued headphone A2DC CODE 23 is designed toHD 660S The perfect blend of power and control. The powerhouse open back headphone Connects you to the deepest corners of your music collection. Hi fidelity sound Open back design 42mm transducers Luxurious comfort Detachable cable A Direct Connection To Your Music Known for their engaging signatures and liquid smooth response, HD 660S predecessors HD 650 and HD 600 shattered performance barriers in the audiophile headphone category. The HD 660S