If you already have a Sony TWS wf1000xm3 (quarterly) do not buy this unit! The difference in everything is not worth 21 thousand. Despite the fact that there is a tiny device, in terms of sound volume it will give odds to many headphones. And the main mistake of many buyers is not set up correctly through a proprietary application, you need to set everything up. And use the services as dizer. And the dizer also needs to be adjusted, switch all settings to the FLAC format, etc. "Is there a difference between AAC and ldac?" I say eat. My phone supports both aac and ldac. If anyone is interested in OnePlus 9 pro. Oddly enough, on the ACC format for one-place, the sound is more cheerful than my iPhone x, or the iPhone 12pro that I recently sold. And a note, I read somewhere that these ears do not bass through the wire like through bluetooth. Not true, on the contrary it is better, but first you need to turn on the headphones for the processor to work.