Sennheiser HD 660 S Open-Back Over-Ear Headphones Panamax surge protector while a tough Santoprene® surround

while a tough Santoprene® surround and marine-grade polypropylene cone pump out the bass

Rear Panel:

Thanks to the digital coaxial connection and the aptX® audio coding algorithm

Tweeters 1"

Sennheiser HD 660 S Open-Back Over-Ear Headphones Panamax surge protector while a tough Santoprene® surroundSennheiser 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