Hi; i received these headphones as a much requested and prayed for christmas present in 1979 as a 13 yr old music fan,I still use and listen with them on a regular basis.I researched and compared them to the panasonic eah 600....well out of my families modest price range,Dark side of The Moon,Trooper albums,Zon,streetheart,David bowie,Harry Chapin,Marianne Faithfull,mike Olfield came to life with impact and have left a lifelong impression.Over the years casual listening by friends have always astounded.these headphone are not by any stretch of the imagination technically correct ,however they are unasuming and incredibly satisfying and enjoyable .
i still have the original boxing and lituriture if you ar interested
robert