A lot of DACs and amps in modern playback devices (phones, computers, car stereos), while super impressive compared to what they used to be, just won’t be quality enough to do a higher res file justice even to trained ears. You might not notice a difference because your current listening gear/environment isn’t capable of showcasing them. Others have explained the differences pretty well but I wanted to add a thought **whether or not the differences matter will come down to the use case, the playback situation, and/or your ears. I can just barely tell the difference at 128kbps with 100% of my attention focused on it. For years I thought the difference was obvious until I took one of those tests. I'd be impressed even if you can tell the difference at 192kbps mp3s. And I challange anyone who thinks they can to post results of an ABX test such as this: Now, listening to a single-time encoded mp3 and a wav, is there a human audible difference? By far most people can't tell the difference. So if you want to know what lossy compression sounds like, re-save an mp3 back to mp3 a few times. If you re-encode an MP3 back to MP3 a few times, the artifacts of the compression will become more and more audible. MP3 is meant for consumption/playback (is lightweight, has metadata, etc), whereas WAV is meant for production, because they can be edited over and over again, and saved and re-saved and won't lose any information. WAV is uncompressed audio (there are ways to make a lossy WAV file, but we won't get into that since it's an old thing which nobody uses anymore), the full information. Mp3 is a lossy compression format (like JPG), which gets rid of part of the information in order to reduce the file size. We should first of all talk about what mp3s are.
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