There is talk from time to time about low latency bluetooth transmitters, and using those to transmit to hearing aids, either with an intermediate device like a Phonak Compilot 2 or a Resound Phone Clip+, or other similar device, or directly to a Phonak Marvel or the Phonak B90 Direct.
The problem is that both source and destination bluetooth devices have to recognize the low latency aptx bluetooth codec in order for low latency transmission to be a reality. I could be wrong but I don’t think any of the destination side hearing aid bluetooth devices, or direct connects, recognize aptx. If that’s true it would mean that the transmission using the aptx transmitter would actually use the normal bluetooth transmission speed and there would be no aptx benefit.
I don’t think there is much incentive for hearing aid companies to add aptx since they all sell their own proprietary TV transmitters that are low latency. The hearing aid brand tv transmitters do work well and they have the added benefit of working with the phone connection so when you get a call in your hearing aids, it mutes the TV transmission until the call is over. They are also normally very convenient to start and stop transmitting.
Here is a quote from an article about aptx:
"It’s also important to be aware that both the sending and receiving Bluetooth device need to support aptX for the benefits to be seen, else the lesser codec (SBC) is used by default so that both devices can still work.
A simple example can be seen if you’re using your phone and some external Bluetooth speakers. Say your phone uses aptX but your speakers don’t, or maybe your phone doesn’t but your speakers do. Either way, it’s the same as not having aptX at all."