Question No audio from right-side earpiece of headphones ?

[CyrodiilWarrior]

I've had these products for quite a while now:

Products:

• Beyerdynamic DT 990 Pro Headphones
• FiiO E10 USB-Powered Headphone DAC

Sometimes audio only comes from the left-side of the headphones. The right-side is silent. I have 'mono audio' switched off. I've tried disabling/enabling the device. I've tried reinstalling drivers. I have the FiiO Control Panel. I've tried the headphones with and without the USB DAC.

Sometimes randomly, the right-hand side earpiece works for a short amount of time. The cable doesn't appear to be damaged, unless it is from my computer chair wheels.

What troubleshooting methods do you suggest?

 

[Aeacus]

What troubleshooting methods do you suggest?

Try the headphones with 2nd device to see if issue is with headphones.

Also, trying 2nd, known to work headphones/headset helps as well.

But as far as you've written, looks like there's RMA waiting for DT 990 Pro. (There is a reason why brand new hardware has warranty.)