They most likely have the Cirrus CS4207, which is quite good. http://www.cirrus.com/en/products/cs4207.html http://www.cirrus.com/en/products/cs4207.html http

They most likely have the Cirrus CS4207, which is quite good. http://www.cirrus.com/en/products/cs4207.html http://www.cirrus.com/en/products/cs4207.html http://ifixit.org/blog/5515/macbook-pro-retina-15-teardown/ http://ifixit.org/blog/5515/macbook-pro-retina-15-teardown/