Range is really poor even 10m (they hinted at 30m as that is what wrote about in spec page) I assume they were talking in general about BT 5.0 as to be 15-20m it would need be BT Class 1 not Class 2
This was on SBC/apttX and aptx-HD, I would not like to guess max range on LDAC as it will be poor but AFAICS how can LDAC be working as the DAC is only 16bit when USB is plugged into Windows.
Amazon Music HD on my phone show it as a Max of 24bit 48khz same as it does for even aptX (Amazon can be little wrong with some of them as aptX is 16bit 41-48khz) but my older Sony WH-1000XM3's show as 24bit 96khz.
I had this issue with the recently launched Avantree D60 USB Bluetooth Audio Transmitter in that is was only 16bit so aptX-HD was basically aptX, I waited months after support told me to wait on a revision which I now have and it is indeed 24bit (they removed the voice transmit/broadcast side of it so the bigger button now sets Low Latency Mode or HD mode).
Also the Volume button are dumb buttons (they do not control the phones volume) this is a major pain if I just disconnected/reconnected as I need to unzip my pocket for my phone as the headphone are up full volume but Android lowers the volume for hearing safety on connection.
Nearly every set I have had apart from one set even cheap ones controls/syncs with the Android volume since Android Lollypop or Marshmallow