“What became immediately noticeable was that the USB connection gives the music a wider soundstage, making stereo seem more spread out. Switching to my iMac’s headphone jack resulted in music sounding more narrow and compressed. Heck, Bluetooth even sounded a bit more open than the iMac’s crappy headphone jack connection. If you judge a speaker by how it is to be used (and you should), then Audioengine’s HD3 wireless speakers are about as perfect as you can get.” —— the-gadgeteer.com