usb powered class d

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In my quest for great sound in small packages, I've wanted to find a class d amplifier capable of working off of 5 volts.
I've found a product available that pretty much does what I wanted to do which is make USB powered laptop speakers that sound good, and get their sound as well as power from a single usb plug (and not a headphone jack)

Does anyone know which class d chip this product might use?

http://www.uniquemodem.com/uniqueEnglish/nf02.html
and a rave review-
http://www.dansdata.com/nf01.htm

Pekar
 
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