I can now report that my fitter updated my 9030s’ firmware to 1.1.1. He then connected the TV Adapter and also had a long conversation with a Philips representative about some settings, including a new “high fi” music program to replace the previous music program. At any rate, I am happy to report the situation with the TV Adapter was much improved once I took it home and tried it with my setup. This is not because the default volume setting on the app seems to have changed. It was and remains 16. But the firmware now saves the latest user-set volume, even if you go in and out of the streaming program or out of the app entirely. (Other programs still do not save latest user settings, but that’s less important if you’re happy with the defaults set during fitting.) So that I’d still like to see the default lowered isn’t really a problem, since the latest user setting on the adapter is saved and prevents the unpleasant blast when streaming is turned on. I was therefore able to disconnect my DAC converter and go back to the optical/Toslink cable from the TV to the adapter with no unpleasant boost to volume. The high-fi music program is nice too, though the default was much too loud and had to be adjusted by my HAS. I would suggest to @Jack_F to have your Costco fitter ask Philips to update the 9010 firmware to accomplish the same thing. Or send an email to mcbg@demant.com and address your concerns to Marc, who is in contact with the developers.