The end caps are retained by clips all the way around. Because it is a small round top, it can be difficult to open all the clips at once. For the top, you can open up the rear clips and lever the top up a little over those clips using the point where the carrying strap ties.

Although when I photographed the speaker, I had a blue shim in place, they came out pretty easily. I had more success with the metal prying tool. You will probably arrive at a technique to open the clips. It is very important to take your time. I may take 5 minutes or 20 minutes, depending on your technique and how lucky you are!