Soundfreaq's Sound Stack is the company's\u00a0third-generation sound dock, and it is designed connect to a smartphone or tablet and\u00a0provide high-quality audio\u00a0for movies, TV shows, videos, games and Internet radio.\u00a0The Sound Stack uses\u00a0custom-engineered, Kevlar-reinforced balance drivers and\u00a0proprietary DubSub subwoofers to create\u00a0powerful bass despite the dock\u2019s relatively modest form factor.\n\tThe Soundfreaq Sound Stack without iPad (top) and with iPad (bottom).\n\tAn\u00a0Apple dock connector fits iPhone smartphones and iPad tablets, but you can also use\u00a0the Sound Stack with most modern smartphones thanks to its Bluetooth support. And a 3.5mm input port lets you connect a computer or media player\u00a0to the Sound Stack. Finally, an optical digital audio input (TOSLINK) means\u00a0Sound Stack\u00a0can\u00a0connect to your Apple TV, DVD player\u00a0and other gadgets\u00a0that have similar digital ports.\n\tThe Sound Stack controls are touch-sensitive buttons, and the input source and\u00a0activity status are clearly indicated by backlit icons on the front face.\n\tThe buttons are dimunitive, but touch sensitivity makes\u00a0that a moot point.\n\tCurrent input source is clearly shown on the front panel.\n\tMy Experience With the Soundfreaq Sound Stack\n\tI'm impressed with the clear\u00a0audio provided by\u00a0the Sound Stack. Bass is strong but not overwhelming. And Sound Stack is particularly well suited for use in small to mid-sized rooms. Soundstage is reasonable, and it can be expanded by activating UQ3 spatial enhancement. I'm not exactly a fan of sound-processing functions, but the Sound Stack's UQ3 feature\u00a0didn\u2019t seem to \u201cdiffuse\u201d low notes as much as\u00a0some other\u00a0sound enhancements.\n\tI was concerned that a docked iPad could affect Sound Stack\u00a0music playback, but\u00a0I\u00a0didn't notice\u00a0any difference in\u00a0volume with my iPad docked.\n\tThe Sound Stack\u00a0has a few unique features and functionality, as well, including a dedicated remote control that affixes itself magnetically to the back of the dock. A USB port on the back can be used to power up compatible devices. The Sound Stack can also be controlled using an iOS or Android app when connected via Bluetooth; the apps let you toggle between input sources and\u00a0provide some basic playback controls. And the apps let you\u00a0access the Sound Stack's FM radio functionality. (Not available on models sold outside the United States).\n\tFrom left to right: Port for AC adapter; USB port for charging smartphones; optical input port; aux in; and a\u00a0port for FM antenna (Included for non-International model)\n\tThe remote control magnetically affixes to the back of the Sound Stack.\n\tConclusion: Soundfreaq Sound Stack\n\tMy one significant complaint: the $399 price tag. There is a lot of\u00a0competition in the audio dock market, and some people may\u00a0not even consider paying $400 for\u00a0Bluetooth sound dock. The Sound Dock does deliver high quality sound, though, and it's clear\u00a0that Soundfreaq really cares about audio\u00a0quality.\u00a0The Sound Stack's range of input sources, excellent build quality and just about every feature you can conceive of\u00a0for a sound dock set it apart from the rest of the pack.