I guess it isn't?
It isn't, it's a general purpose digital communication system. The digital bluetooth stream will go through a DAC process in your wireless headphones.
Great. No need to worry about upstream DAC then.
As you say, just get one of those aptx dongles and that should be as good as it's going to be on Bluetooth.
Another upgrade to purify the signal would be a dedicated streamer with USB out to get away from laptop signal noise. Plug the aptX dongle into the output and you might (might) get an improvement.
@ChasnotRobert started
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It isn't, it's a general purpose digital communication system. The digital bluetooth stream will go through a DAC process in your wireless headphones.