aptX is a digital audio technology which enables streaming of high quality (CD-like quality) stereo audio over Bluetooth connection between the Bluetooth source device (such as a smartphone with Bluetooth feature) and a Bluetooth “receiver” device (such as a Bluetooth speaker).
To enjoy the high quality music streaming with aptX technology, both the “source” device (such as a smartphone) and the “receiver” device have to be equipped with aptX technology.
You can get more information about aptX from this site: http://www.aptx.com/ .
