i have a ROG Strix Z490-e gaming mobo, and i am using it with 4 cables output from the back pannel to my 7.1 speaker system. from the realtek audio console, i can test and hear a sound from all 6 speakers and the subwhoofer except the rear right channel. i tested/inverted output cables, as well as tester speaker cables. which confirms me that all cables are fine.
on a side note, i owned previously an asus rog strix z390-e mobo. all channel worked perfectly. i switched mobo past week, reformated from scratch with a USB stick, so i cleared all drives, nothing was kept.
i did formated 3 times so far. using driver version from asus download web site.
audio driver version : 6.0.8960.1
ui version : 18.104.22.168
if you have any suggestions, i'm all ears.
best regards. -FD