Gently lift up the unscrewed rear hinge as much as is comfortable over the internals.

Using the extra slack from lifting the rear hinge, carefully pry out the socket of the front hinge out of the speaker casing with the flat end of a spudger.

When you see a yellow ring appear in an opening on the top of the hinge, you're almost there.

Once the socket is out, gently lift the whole headband arch away from the speaker.