I have two Bluetooth devices that I would like to be able to connect wirelessly to my home stereo receiver. One is a Droid Razr Maxx smartphone, which I know is AptX capable. The other is a brand-new Sony VAIO flip laptop computer that I have no idea is AptX capable, but if it isn't, then I may buy a USB AptX dongle for it. I picked up a Logitech Wireless Speaker Adapter, which I have plugged into my stereo receiver via composite inputs on the receiver. I'm not too satisfied with the sound quality when trying to transmit music from my Razr Maxx to the stereo receiver, and am thinking that I might be able to get a big improvement by switching to an AptX-capable speaker adapter. My understanding of how AptX works is that both the "source" and the "sink" have to be AptX capable. I know what the source is in this case (the smartphone, or the dongle for the laptop), but am unclear about what the "sink" needs to be. Is it the wireless speaker adapter, or the Pioneer stereo receiver, or the speakers? In other words, if I just make sure that I get an AptX wireless adapter to plug into my old stereo receiver via the composite inputs, am I good to go, or does the stereo receiver itself need to be AptX capable? My stereo receiver is a 7-year-old Pioneer receiver, so I'm pretty sure that's not AptX capable, and I know that the wired speakers aren't. The AptX speaker adapter that I am thinking of getting to replace the Logitech is this Rocketfish adapter. If anybody knows of a better one that's less than about US$50, please let me know.