atmasphere YT is a terrible place to do any sort of assessment at all. The recording system can be quite varied (smartphones are bad at that as they have limiting and compression, and their tiny little mics are no good at capturing bass), where the microphones are placed is a big deal and YT itself has a compression algorithm. The biggest variable is the room itself.
YT videos of people’s sound systems are an unfortunate waste of memory.
Those are always a good excuse for bad sound systems.
In below, my system is playing free YT downloaded MP3 files (very low quality, see at 2:45, Eric C, 130~150 bit). I record and upload Eric C music file again (compress again as you mentioned). I don’t think YT sound is terrible. In YT, you can find many my system videos by others. Alex/Wavetouch audio
Eric Clapton - Tears in heaven, Krall - Temptation, Wavetouch audio live

