I must be the only one that watches YouTube on my TV played through my main system and my DAC. sounds quite good to be honest and some reviewers take the time to record well. most of the stuff I see is 44khz on my DAC.
its good if they compare to another speaker, or if they use the same recording set up for all recordings you can get a feel for the differences to other equipment reviewed.
not perfect but a good starting point IMO.