Sennheiser HD 660 S Open-Back Over-Ear Headphones Panamax surge protector 12-volt trigger input for delayed

12-volt trigger input for delayed outlets

cleaner performance

one stereo RCA output for recording to an external device like a CD recorder

Tweeters 1"

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

Sennheiser HD 660 S Open-Back Over-Ear Headphones Panamax surge protector 12-volt trigger input for delayedSennheiser 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