I don't know, I compared YouTube with Prime Music and the latter definitely sounded way better.
For that speaker demo, I think my small speakers eliminated the woolly bottom end of the Markbass, while not allowing the bottom end of the Barefaced speakers to come through. They are odd little things, as some music sounds great on them.
I'm not a small speaker sceptic - have a PJB C4 which has loads of bottom end, it just isn't very efficient.