Hi Daniel,
Comparing it to my HTC 9 mobile phone, from 10 meters away from my router in my lounge there are 2 brick walls mind you, the signal between my phone and the tablet is about 1 bar less in Android and 2 bars less in Windows 10.
It is fine to use 10 meters away, however when I go further in my garden say 25 to 30 meters away, I am still getting a signal with my phone and can still get online etc… where I can not get anything on the Chuwi Hibook, so it’s not completly dire.
Audio is loud enough to watch a movie or listen to music however the sound quality is not as good as my HTC 9, but the HTC 9 is known to have great audio for a small device.
If you have bought a Chuwi Hibook, I am sure you’ll be satisfied with the quality vs the price.