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 - 16 August 2018 125 0 SHARE Facebook Twitter Go to the deal page: Massdrop x Sennheiser HD 6XX Open Back Headphones (Rebranded HD650) $200