A2+ – It's clearly better than A1, in this case Audioengine's new wireless speaker [$269/pr] with Bluetooth aptX, micro USB, stereo RCA i/o plus a stereo mini input. The works load into the left 'master' speaker inside a 18mm HDF cab with 60-watt class A/B power, a CSR8670 DAC for 16/48 processing plus auto-switching 110-240V mains. The driver complement is a ¾" silk dome tweeter and 2.75" aramid fiber mid/woofer.