The "2011 Remastered" tag refers to a specific era of digital restoration where engineers aimed to balance the "Loudness Wars" of the 1990s with the clarity demanded by modern audio equipment.
For a guaranteed high-quality experience, it is recommended to listen to the official remastered studio albums available through authorized retailers or the Official AC/DC Store remastered studio albums ac dc the ultimate best of 2011 remastered 320 kbps