Music but no voice on headphones [duplicate]

I have normal stereo headphones which work fine

On a specific PC running Windows 7 the external speaker and USB speakers work fine too

But when I plug in the headphones, all I hear is muffled music, no voice track? It sounds like it is being split into 5.1, and I am getting just the L & R components, and not the centre voice channel?

In the Playback devices (sound) control panel, I can adjust stereo or 5.1 for external speakers or USB speakers, but not for the headphones. The config button is grey out for them

Is this the problem, if so how do I fix it?

Solution 1:

For me my problem was that the jack thing was tilted a tiny bit, so little no one would notice. I just pulled it to the side with force and it worked flawlessly no matter how I spin the jack.

Solution 2:

Make sure Windows is picking up the headphones within Control Panel/Sound (it should tell you where you've got them connected)

If you have other ports (check the front of the PC for any green ones) then use these before any rear ports. Do you have a 5.1 system connected? If so see if it has a headphone port built in.