Here’s the latest update on the issue for everyone. It explains why they previously reduced the volume and how they now can keep it loud for us while it is plugged in:
Wyze Sense Hub volume is lower than it used to be
We’re happy to say that we just released new Wyze Sense Hub firmware for this! Please check it out and let us know how you feel about it. This has different logic than before because there was a battery drain issue with the louder volume previously. Now we’ll have louder volume if the power cable is plugged in and delivering power and go back to the decreased volume if the hub is running on the backup battery to make it last longer. We’ll be removing this from the update list moving forward.