Following its success with the first-generation Xeo wireless loudspeaker systems, the Danish audio brand Dynaudio has released a second generation. The new Xeo 4 bookshelf speakers ($2,300 per pair) and Xeo 6 floor-standing speakers ($4,000 per pair) come with a handful of upgrades, including compatibility with higher-resolution music files (up to 24 bits/96 kHz), better driver tuning, and improved digital-signal processing. The speakers are made for pairing with the new Xeo Hub ($300), which sends the audio s…