just get these in the mail and test they by listen to a wide range of music . death metal , dubstep , punk . one of the reveiwer complain that they be not loud enough . although I think the reveiwer 's standard be too high for these $ 20 headphone , I definately agree with he in regard to the lack of loudness , though this issue be not major enough to give this item anything less than 4 star . I do not know the technical term to describe what I be hearing , but I can here a slight `` drown out '' of high treble when I listen to certain music such as melodic death metal . these be worth the $ 20 imo .