Continue to move the opening tool along the edge until the entire casing is open.

Around the speaker is an extensive amount of adhesive (the white ribbons) and will require more force to separate.

Pay attention to the orientation of the speaker.

Once the left speaker is accessible, use your fingers or some tweezers to pull the speaker upward and out.

Again there will be adhesive to make the process that much more enjoyable. Who doesn't like a challenge?