Remove four 13 mm JIS #0 screws attaching the rubber spine to the speaker, located on both sides of the inside of the speaker.

Use the plastic opening tool to release the clips holding the central part of the rubber spine.

Pry away one end of the rubber spine with your thumbs and it should come off.

Prying off the spine may take some persuading.

The speakers are strong magnets. Keep it away from other sensitive electronics.