About the sound. In my opinion, there is no point in buying them if you only want to use them in conjunction with the phone. I'm sure that Beats at 2 times cheaper will give you the same quality as B&O. I don’t know how things are with new phone models (read from 2022 and newer), but on the Iphone SE and Asus M1 Pro, the sound is quite quiet via bluetooth. And it's not the headphones' fault. It's just that these devices are not able to pump these headphones. Yes, and music, whether it be MP3 or FLAC, will not allow you to appreciate the beauty of this sound. The full potential of the headphones is revealed when at least USB amplifiers are connected (I personally bought the Japanese ONKYO DAC-HA30), which is another 30 thousand. In addition, I strongly advise you to download / buy and listen to Hi-Fi studio formats (DSD, DSF and others), and their phones will not play, only a computer. And they will take up about 100 MB of space per minute of listening. If you are ready for these expenses, then you simply will not want to listen to other music with other headphones.
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