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 - 22 July 2018 157 0 SHARE Facebook Twitter Go to the deal page: Massdrop x Sennheiser HD 6XX Open Back Headphones (Rebranded HD650) $200