It sounds like the issue you are experiencing is that your AV equipment is able to connect to the local network (the Hub 4 router), but not able to connect to the internet. This could be due to several reasons:
Incorrect IP configuration: Ensure that the IP configuration settings for your AV equipment are correct, including the IP address, subnet mask, and default gateway.
Firewall restrictions: Ensure that there are no firewall restrictions on the Hub 4 router that are blocking the AV equipment's internet access.
DHCP settings: If your AV equipment is not getting a valid IP address from the DHCP server on the Hub 4 router, it may not be able to connect to the internet. Check the DHCP settings on the Hub 4 router to ensure that they are set up correctly.
Router Configuration: Make sure that the router's configuration allows for internet access. Check the router's settings for any restrictions or filters that may be blocking the AV equipment's internet access.
It is also a good idea to check the manufacturer's website or user manual for any specific configuration requirements or troubleshooting tips for your AV equipment.