Does anyone else here have a G930 headset?

I have noticed the white noise that is generated when the headset is switched on is driving me mad. Went through the logitech forums and they were no help. Switched off sidenoise etc etc and no matter what I do its still there, especially noticable after playing music.

Anyhow I am trying to work out if this is normal or if I need to take them back to Harvey Norman.

My H600's were completely silent when no audio was being played.

It sounds like a blank cassette tape being played - or an amplifier running.