C4W3 painful high-pitch whistling on 3 videos

The videos in Model Management and Deployment Infrastructure (namely Managing Model Versions, Continuous Delivery & Progressive Delivery) have a very high pitch whistling sound throughout, which is pretty uncomfortable to the ears, leaving my hearing a little dulled/numb… after only a short time.

I’m using a Macbook so that possibly doesn’t help but none of the other videos in this week has this whistle, or at least is not as noticeable as this.