The headphones, right out of the box, do not have a sound quality that meets our expectations. At first, sibilants are really noticeable, and there is a significant amount of a deficiency in bottoms. It is necessary to run the headphones through a series of exercises using specialized sound files in order to bring forth the headphones' full capabilities. It is not difficult to locate on the internet both warm-up files and an explanation of how to warm up headphones in the correct manner. I get ready to go like this: - With a volume of 70–75% over the course of 48 hours, - Maintain a volume of 75–80% for the next 48 hours. And for the next twenty-four hours, keep the volume between 80% and 85%. In total, there are 120 hours. After warming up, the sibilants have totally disappeared, and the sound of all of the cymbals and the rest of the percussion is quite authentic. - Low frequencies have undergone a transformation of an order of magnitude, which can be characterized by both quantitative and qualitative shifts. Even though there is a lot of bass, the mids do not become bogged down by it at any point. - The meat of it was delicious. Got even better, even more thorough. In general, the sound quality of the headphones was consistent across the entire frequency range of plus five. - Due to the fact that the sound pressure has also increased, you will need to adjust the volume level on the player whenever you listen to audio now. In my opinion, at this time, these are the greatest wired, dynamic, in-ear headphones in the price range up to 4000 dollars that require a proper warm-up to perform at their full potential.