New update, 26th November: https://www.sdrplay.com/update-on-rspdx-availability/
Meanwhile, Clint from the Oxford Shortwave Log YouTube channel has posted four more videos showing the benefits of HDR mode on the RSPdx – In all cases, the first half of the recording is with the new HDR mode engaged, the second half with it off. You get tell the switch-over point from the appearance of the LO frequency with HDR off.
This fourth video of a longwave signal – from Nador, Morocco on 171 kHz, is probably the best example thus far of how the reception of weak signals can be enhanced through the use of HDR mode. In this recording, the audio from Nador is quiet, but clear. Once HDR mode is toggled off, the audio basically disappears. Clint encourages you to add comments to hid videos.