I listen to them mostly metal and rock to my ears, they seem to be designed for this music. But at the same time, if I decide to listen to the classics or an instrumental, I am quite satisfied with the sound. P. S. If you friends bought and heard not what you expected and wanted, then this is a normal phenomenon, it was the same with me. Be patient for about two weeks, then you will understand how cool they are. The bass will become more velvety whistle at high the aluminum shade will disappear the ears will stop hurting the hearing will remain intact) Alternatively, turn on the music and put the headphones on the table, the volume for the first 4 days at 50 - 60 then for 10 days at 70 - 80 for about 4 hours a day . I wish you all good luck and happy listening)))
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