One of the world's best compact audio systems just got a nice upgrade. The A2+ is the same as Audioengine's A2, with 6-inch-high speakers that share the same great acoustical engineering. The difference is that the A2+ has a built-in USB DAC and costs $249 vs. $199 for the A2. "We didn't want to change the mix too much," Audioengine co-founder Brady Bargenquast said.
