From a quiet corner of Linkplay Technologies headquarters in Newark, California, WiiM has rapidly become one of the real forces in affordable network audio streaming. If you foresaw a brand that's not even four years old picking up the slack left in the wake of Sonos' self-immolation last year, congratulations--your powers of prescience are considerably better than mine. This Amp Pro is the company's latest demonstration of its entry-level prowess. A mere 379 buys a compact (2.6 x 7.5 x 8.5in, HxWxD), tidily constructed aluminum box that's equipped to power a single pair of passive loudspeakers and provide a gateway to network music streaming. It's ready to become part of a multiroom and/or smart home system in conjunction with Amazon Echo, Google Nest, Linkplay and WiiM devices.