I do not recommend using it for listening to music. Listening to speech is normal, more or less, at least if there is nothing to compare it to. Sound quality compared with AKG K52. I didn’t use the microphone, I put the rating just to put something. On the wire, the sound is more or less normal. I measured what frequencies are heard, it turned out 40Hz-12KHz. Since the sound is decent on the wire, maybe then the bluetooth module is to blame? Don't know.
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