The Mini Transparent Speaker

The Mini Transparent Speaker ($550)  from Stockholm-based Transparent Sound designed a splendid minimal speaker. The single-piece aluminum frame has side panels of tempered glass, so as to put the dual full-range drivers on display. A built-in amp provides power, built-in Bluetooth provides a wireless option, and "True Wireless" support lets you pair two units together for a broader soundstage. There are a volume control and an input on the front, and a compartment in the bottom that provides both USB power and an input for an Echo, Sonos Hub, Chromecast, or similar additional wireless device, giving you the ability to upgrade the system as needed.