Strip about 1/4" of insulation off the ends of the red, green and white wires. Twist the ends of each wire to wind them tight. Apply a little flux to the new speaker terminals to promote a good solder joint.

With pushbuttons facing down, and while facing the front of the terminals, solder the red wire to the right terminal, the white wire to the left terminal and the green wire to the second terminal from the right. Strip and solder a bridge wire between the middle terminals. NOTE: solder white wire near the end to ensure it's not stretched too tight.