No extra drivers are required. With the CXA switched to USB Audio 1.0 the CXA will work with the native Mac OS-X 10.5 (Leopard) or above Audio 1.0 driver and accept audio up to 24-bit/96kHz.
With the CXA switched to USB Audio Class 2 the CXA works with the native Mac OS-X 10.5 (Leopard) or above Audio 2.0 driver and can accept audio up to 32-bit/384kHz.
How-to guide
1. With the CXA in Standby mode and/or the volume set to minimum, connect your Mac to the CXA via a USB A to B cable, or C to B cable depending on the USB ports on your Mac
2. Select the USB Audio source on the front panel of the CXA
You can do this by pressing the Bluetooth/USB button, which will toggle between the two inputs. The USB Audio is shown by the symbol being lit orange
3. Choose the CXA as your output speaker via your Mac’s sound settings
Note: To ensure you are getting the highest quality playback possible, ensure that the maximum sample rate for the CXA is selected, up to 384 kHz.
This can be done via your Mac by selecting ‘Audio Midi Setup > ‘Sound’ > ‘Speaker Properties> ‘Advanced’ Tab and selecting the maximum sample rate and bit depth from the drop-down menu.