• Send: right-click → Network → Output and wire into the new Network Out. Its name is what other PCs see; its card says how many are listening.
  • Receive: on the other PC, right-click → Network → Input and pick the stream - listed by name and PC.
Game Audio
Network/gaming-pc
Output
L
R
Headphones
WASAPI/Headphones
Input
L
R

Streams are found automatically on the local network, wired or Wi-Fi. A Network In remembers its stream and PC and reconnects by itself after a restart on either side, or when the Network Out is deleted and added again with the same name - so give each Network Out on a PC its own name.

Card showsMeans
Network / <PC>Receiving from that PC
no audioThe PC is there but its Network Out has nothing wired in
waitingThe PC cannot be reached; it connects when it can

Delay is about 10-20 ms on a wired network and 30-60 ms on Wi-Fi. Each stream is stereo and about 3 Mbit/s.

Preferences → Network sets the latency mode, this PC's name, PCs to reach over a VPN or another subnet (Remote PCs), ports and the adapter.

If no streams appear, check the network is set to Private in Windows - Windows Firewall blocks them on a Public network.