Sennheiser HD 660s Audiophile Headphones (B-Stock) - Discontinued bluetooth Crossfeed Effect Completed by Hardware

Crossfeed Effect Completed by Hardware Circuit Design

and when combined with how open-backed headphones usually look

2m 392-strands silver-plated monocrystalline copper

Standard equipment on all series of the following headphones: RS1

Perfectly drive any headphone/IEM with 4 levels of gain and up to 15Vrms output

Sennheiser HD 660s Audiophile Headphones (B-Stock) - Discontinued bluetooth Crossfeed Effect Completed by HardwareHD 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