I have been using it for three years, I recently lost it, I bought the same ones, since you can still find them. I also have senheisers cx 300II, they have very high frequencies, they are loud, it just hurts my head, the equalizer does not help. I also compared it with some other plugs (from acquaintances), I did not find anything more suitable. Each person hears different frequencies differently, and therefore they need to be selected individually. I can listen to music in these for a long time without experiencing discomfort, and I like the sound. Great headphones.
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