Thanks Folks
The AptX is not proprietary to Minelab, it's just another upgrade to Bluetooth tech. It IS proprietary to QUALCOMM. But if the information (from Minelab) is correct, if you have HAs that can run this new AptX Bluetooth, you can listen to audio from the NOX detectors. My study also found that audio devices that can run AptX are increasing, including other headphones which will work with the NOX detectors.
The main value in the AptX tech is the low latency, which I'm not sure will be needed in HAs. (I have one of the newest BT HAs, the Oticon More) Latency doesn't seem to be an issue with current HAs.
The latency problem is driven by the need for speed. While swinging a detector you obviously want the audio to instantly report a find.
I'm new to detecting, but a scientist, so I will continue to monitor and hope for a HA solution (and report).
Stephen