Polk MagniFi Mini AX soundbar ($399)

The MagniFi Mini AX is just 14½ inches long, but it sounds more enveloping than most larger soundbars do—which means it can conjure up convincing sonic images of anything from Carnegie Hall to Batman’s Gotham City, all from its 3D Sound mode. Not only does it connect to your TV, but it also works as a surprisingly sweet-sounding music system, streaming through Bluetooth or Google Chromecast.