You will be surprised just what the microphone picks up if you use a quality microphone.
Whats the difference between picking up a hifi and picking up a band or drum kit.
Obviously just using laptop speakers might not be ideal but plug some decent headphones kef space one are very decent into a dragon fly red and you can get a pretty good idea of what was there.
Plus if you watch more of these vids then you get a feel for the sound of that room so you will be able to hear the differences.
Thanks for the shout out in this thread I thought it would surprise a few people