Hello ! I also sometimes use my DP-X with a Bluetooth Sony mdr 1000x connection. -- I do not think the DP-X uses aptx HD codec but rather aptx, without the HD; double check. But I personally think the difference does not often matter with many Bluetooth headphones used in a noisy environment, while moving at home etc. I would nevertheless hope a aptx HD codec in one next firmware release. But the aptx codec is proprietary and I do not know if there needs to be a change in the hardware... Same with LDAC from Sony. -- In my case, my Bluetooth connection is weak. It works well between my Sony mdr 1000x and my phone. The link between the mdr 1000x and DP-X is nevertheless still usable and not such a big deal but it can get annoying in some rare cases: I sometimes lose the connection when just moving my head from one side to another. The antennas of the DP-X and my headphones are interfered by my head. Another example: the connection can be lost if the DP-X is inside a bag carried the one hand opposite from the headphone's antenna. I need to carry my bag on the other hand. My body interferes the connection and I can swear you here that I am not made of metal; just water. Losing the connection means I get compression glitches, sometimes until I move the device closer to the headphones. Bluetooth pairing does not get lost. Would this weakness come from the heavy metallic material, or for saving the weak batteries. It is maybe the same story with Wifi. The DP-X is indeed primarily designed for wire connection. But on another hand, such an expensive device should offer proper connections although I totally understand this is not a priority.