Home Slickdeals New Drop Customers: Massdrop x Sennheiser HD 6XX Open-Back Headphone w/ 3.5–6.35... Slickdeals New Drop Customers: Massdrop x Sennheiser HD 6XX Open-Back Headphone w/ 3.5–6.35 mm Adapter $169 + Free Shipping $170 By ARCOM - 19 January 2024 17 0 SHARE Facebook Twitter Go to the deal page: New Drop Customers: Massdrop x Sennheiser HD 6XX Open-Back Headphone w/ 3.5–6.35 mm Adapter $169 + Free Shipping $170