Wrong sound balance via headphone port, iMac 5k

[texxnic]

Hello everyone!
Sry for my bad english, but i will try to explain my problem.

I read what Yosemite set wrong sound balance, but i have another problem.
When i plug in headphones into 3.5 port, right channel plays louder than left.
Helps only set balance on 75/25 ratio. I tried another headphones, and those headphones on another Mac, they are is ok.
Balance via built-in speakers is ok.
in Windows same problem (thanks that i think this is hardware problem).

I am already reset NVRAM and SMC, no changes happend(

Thanks for any help!)

 

[Dopeyman]

I think Yosemite has a problem saving the balance on the sound output.

Every time I switch from BootCamp and back OSX, the balance keeps getting moved. So I have to manually move it back to the center.

Check your sound preferences and move it to the center.

 

[texxnic]

I think Yosemite has a problem saving the balance on the sound output.

Every time I switch from BootCamp and back OSX, the balance keeps getting moved. So I have to manually move it back to the center.

Check your sound preferences and move it to the center.

I hear about that problem, but i have completely another situation. When balance is on the middle, right channel much louder than right.