Home Back To School Massdrop x Sennheiser HD 6XX Open Back Headphones (Rebranded HD650) $200 Back To School Massdrop x Sennheiser HD 6XX Open Back Headphones (Rebranded HD650) $200 By ARCOM - 15 October 2017 219 0 SHARE Facebook Twitter Go to the deal page: Massdrop x Sennheiser HD 6XX Open Back Headphones (Rebranded HD650) $200