Sennheiser HD6XX / HD650 (MassDrop) Cuffie più accessori
Very 1st Production Run contracted by the MassDrop Group Buy in 2017. These have been Beezar Audio's personal set of headphones, used sparingly as an infrequent backup to HD800 headphones. Sennheiser HD 6XX (HD 650) Headphones Plus Accessories.