Paid a total of 420. sounded right away, with no prior warming up required. Fifty songs were used in the test, and the results showed that there were no issues. The frequency response is excellent (in my opinion), with highs, mids, and bass that are slightly emphasized. When we talk about bass, it goes all the way down to infrasound. There is no need for an equalizer because everything sounds as it should. Because the overhead of high MP3 compression can be heard, it is not recommended to use bitrates that are particularly low. They are designed to fit snugly in the ear canal and will not move around. Even with the Nokia 5230, the volume is quite high. I should add that a year later they both passed away, and we replaced them with the exact identical ones. And one differs from the other (oval sound guide). The sound is just awful. Changed over to the Sony MDR-EX15LP.
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