There's a little bit of adhesive under the loudspeaker. It's possible to remove the loudspeaker without heating the adhesive but if you're having a hard time removing it, you can use an iOpener to soften the adhesive.

Slide the flat end of a spudger under the right side of the loudspeaker unit.

Pry up the loudspeaker unit until you can get a good grip.

Remove the loudspeaker unit.