To be taken without hesitation work properly even on a USB hub. Because even if the Mac is compatible with this codec, it is unable to maintain the quality of this codec if you have for example a keyboard or a mouse bluetooth. The connection is then made in CSO = SBC ?. (Make a ALT on sound equipment connected to see the codec used) With the BTD 500, we have a new sound device, easy to switch the output always with the ALT key on the icon Speaker. The scope is much better than the Mac, but I have not tested the maximum radiation. LED BTD 500 turns purple in APT-X, at least it's clear as information
Source: I just Discovered this A Few minutes ago, maybe it'll be handy for --other Mac owners using APT-X Bluetooth audio devices able.
While holding down the Alt (Option) key, click on the Bluetooth icon in the menubar, and choose the Bluetooth device in question. If it Indicates "Codec: aptX"