The speaker makes contact to the mother board by two pads, no soldering required. Just place the new speaker in it's slot along with the rest of the buttons.

To re assemble put back down the mother board to it's original position and follow the steps in reverse. I would recommend doing a dry test by just holding the console together and testing it out before you screw anything back in.

A few things for re assembly , make sure the power switch remains in the back casing as it can easily fall out, and make sure it is set to off. Do not lose the square nut on the back casing as it is not replaceable.