Home Headphones Massdrop x Sennheiser HD 6XX Open Back Headphones (Rebranded HD650) $200 Headphones Massdrop x Sennheiser HD 6XX Open Back Headphones (Rebranded HD650) $200 By ARCOM - 6 March 2018 155 0 SHARE Facebook Twitter Go to the deal page: Massdrop x Sennheiser HD 6XX Open Back Headphones (Rebranded HD650) $200