the sound coming out of my mba was terrible. it was broken and i was using external speakers.
Finding the right part from ifixit was great and with the clear how-to instructions it was a cinch. thanks and kudos to you!
May i suggest, that you identify the orientation when you say the "right speaker".
It took me a while to discover that the right speaker will be actually on the left when you open up the MBA because it would be upsidedown.