Sennheiser HD 660S2 Headphones headphones for audiophiles with deep bass extension and refined acoustics for and Premium – Open-back, over-ear PC,

--------------------------------------------------- 【Voltage Compatibility】 Our products are selected to support international voltage ranges (e.g. 100–240V). However, please make sure your local voltage is compatible before use, as incorrect voltage may still cause malfunction.

【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary.

【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device’s requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product.

【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without appropriate voltage or equipment. --------------------------------------------------- Audiophile-grade open-back sound: These Sennheiser HD 660S2 over-ear headphones deliver natural, high-fidelity sound quality with an expansive soundstage. The open-back design makes them ideal for immersive listening and extended listening sessions. Precise highs and deep sub-bass: Featuring ultra-lightweight aluminium voice coils and 42mm drivers with optimized airflow, Sennheiser's open-back headphones deliver detailed highs, rich mids and deep, controlled bass – ideal for music makers, gamers and podcasters. Powerful Bass Performance: The HD 660S2 wired over-ear headphones deliver double the bass pressure, delivering clarity and precision with exceptional balance from the lowest notes of the piano (27.5 Hz) to the bass drum (45–60 Hz), making them ideal for gaming, studio work, and desktop environments. Exceptional comfort: Open-back headphones with soft, breathable ear cushions provide fatigue-free listening comfort for long sessions, whether you're listening to music or gaming. Premium Build Quality: Designed in Germany and made in Ireland, these over-ear headphones are carefully crafted to offer durability, sleek design, and long-lasting performance. They're the perfect choice for music lovers and music producers. Detachable cable convenience: These wired over-ear headphones come with a long, detachable cable for flexible connectivity to desktop systems, audio interfaces, portable devices, and more. Ideal for audiophiles and professionals: Sennheiser wired headphones are ideal for home music listening, studio monitoring and for listeners who demand uncompromising clarity and detail.