"You haven’t heard it all until you’ve heard the speakers inside the all-new MacBook Pro. For something so thin and light, the sound is huge. And with a wide dynamic range, optimal balance, and a crisp, expressive quality, these speakers might sound too good to be true. That’s because we labored painstakingly over the design to maximize the quality of every decibel you hear."
Some laptop computer manufacturers in the PC world who've partnered with some major audio brands such as Altec Lansing and others to deliver notebook computer speakers to brag about. Remember, at one time, such as during the Slot-Load iMac, and G4 Cube era - Apple and Harman Kardon teamed up on Odessey and iSub speakers to deliver a vastly superior audio experience.
These days though, portability, smaller-form factors ala the MacBook Air and now razor-thinner MacBook Retina place internal computer speaker systems under tremendous pressure to fit into ever smaller spaces. Well, at least in15" MacBook models, the other aspects of component miniaturization (from SSD drive modules to denser battery technology to ever-shrinking logic boards) DOES leave a bit more room for advancing micro-speaker design implementations as well. The one thing speaker cones need most is surface area to deliver full-range frequency response - and it's precious little space they're provided with as the compromise.
On a recent trip to my local Apple Store I have to at least concede this: The Retina Display MacBook's speaker system sounds a hell of a lot better than the one's buried under a MacBook Air's keyboard, that's for sure.