Home Slickdeals Massdrop X Sennheiser HD 6XX Open Back Headphones (Midnight Blue) $179 +... Slickdeals Massdrop X Sennheiser HD 6XX Open Back Headphones (Midnight Blue) $179 + Free Shipping By ARCOM - 25 November 2022 20 0 SHARE Facebook Twitter Go to the deal page: Massdrop X Sennheiser HD 6XX Open Back Headphones (Midnight Blue) $179 + Free Shipping