When I wanted to buy the rmbp I visited the apple webpage about it. It said "Breakthrough Speakers...". When I tested the sound myself it was great for such a slim notebook. I haven't heard any ultrabooks sound this good except some that have an external woofer like asus which are not really portable with the notebook. Recently I became curious about the 17" mbp. I haven't seen any 17" MacBooks myself yet. But from the pictures I can see it has large areas for speakers. Have you heard how a 17" mbp sounds? Does the Retina mbp use a newer technology that it even sounds better than the 17" macbook? I just became curious about how notebooks sound. If you're interested reply about your experiences.