Question Problems with 5.1 audio with Asus Xonar SE.

[interstellar45]

Recently bought Xonar SE after onboard realtek alc662 stopped functioning.

Speaker output (test sound using asus's driver) :
1)FL :- works fine
2)FR:- no sound
3)Center :- no sound
4)SW : - works fine
5)Side Left :- works fine
6) Side Right:- sound is played through Side left

My 5.1 speaker setup is connected to soundcard by 3 RCA cables.

system information :-
Windows 10 1903 64 Bit
i5 4440 , gtx 1050

Also, I only disabled Nvidia audio controller from device manager instead of uninstalling it, can it be the cause of the problem ?

 

[interstellar45]

update :- i changed speaker rca wires and now all speakers are working fine except for side left and side right.
Side left is still playing sound for side right too.