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Honestly, they are probably just your generic Made in China stuff. If they had some folks at Harman International (HK/JBL/Infinity) come up with something just for this, it would've been mentioned in the marketing literature somewhere. Most low-end speakers are manufactured in China, just off-the-shelf designs, maybe tweaked a little. You normally are looking at at least a few hundred per pair for speakers that aren't made in the third world.
 
I wouldn't concern myself too much with the brand of speakers. I have opened up my fair share of notebooks with Harmon Kardon, JBL, etc. stickers on them. You would be disappointed to find that the speakers are often generic. JBL or HK paid to get their names attached to the notebook, but trust me there isn't anything special inside. The speakers Apple uses are custom designed to fit in the space available. Typically, the speakers are encased in an enclosure. Not sure if the enclosure is tuned, but I'm sure the enclosure improves the sound somewhat. There is really only so much you can do with the sound from a notebook. Designers are really limited by space (particularly in Apple notebooks). In the larger PC notebooks designers can install larger diameter drivers which is the only way you're going to get any respectable bass.
 
Maybe they are the result of a joint venture between Apple, Wisdom Audio, Kharma & Acapella Audio Arts :)
 
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