JBL SoundFly Air
For compactness and wireless capabilities, JBL’s SoundFly Air appears to be one of the top contenders. It arrives as a 20W box (measures 3-5/8 in x 190mm x 2-13/16 in) and plugs directly into your wall outlet. SoundFly Air also arrives with a downloadable app that allows the user to browse music with cover art, adjust volume, and customize the digital signal. The product can also link up to four speakers for audio throughout the home. It might be more appealing if the device were portable, but worth a look for audiophiles.
Purchase on JBL for $199.