A couple quite entertaining and educational videos from Audio Science Review:
https://www.youtube.com/watch?v=Gf3Yez8WTz4
https://www.youtube.com/watch?v=dLghg0QXPzs
https://www.youtube.com/watch?v=Gf3Yez8WTz4
https://www.youtube.com/watch?v=dLghg0QXPzs