People post YouTube videos of their speakers all the time. You can definitely hear things, but that includes a heavy dose of room sounds. For an extreme example, try this: https://youtu.be/RUXelNQTIFQ
There is one guy on youtube who posts some very high quality speaker comparisons. The recording quality is very good, the sound level is matched, and you can really hear the difference between speakers. Here is his most recent comparison. He has a bunch of comparisons of various high quality speakers, and some other videos of various speakers.
Imo the Crutchfield system does some things really well and some things not so well. The differences you hear between one speaker and another on their site are pretty small. There's a reason for that, which I'll keep to myself for now because I have plans to do something along similar lines some day.