Sennheiser HD 660 S Open-Back Over-Ear Headphones Definitive Technology known as Controlled Dispersion Technology

known as Controlled Dispersion Technology (CDT)

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8 Self-tapping screws

SVS's exclusive SoundMatch crossover sports premium-grade capacitors

Sennheiser HD 660 S Open-Back Over-Ear Headphones Definitive Technology known as Controlled Dispersion TechnologySennheiser HD 660 S Open Back Over Ear Headphones The HD 660 S Open Back Dynamic Headphones from Sennheiser are headphones for the passionate audiophile and are crafted for the most demanding listener. Built with a transducer design that delivers lower harmonic distortion, they provide a natural, lifelike audio experience and can be used to produce crisp bass, transparent mid frequency response, and a natural treble when connected to high res players