Place the newly assembled panel onto the headphones and part of the cushion as shown in the image. This way is easiest to keep the speaker within comfortable distance of the wiring from the headphones.

If the original solder from any of the wires was lost, you will require a small extra roll.

Solder each wire to the new speaker's motherboard, beginning with the blue one onto the largest of the three metal plates. In this case, start on the right. The red wire will be in the middle. The blue wire will connect on the left side.