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Quoted from jwso

So what does Exciter mode actually do? I noticed it changes the maximum volume, but it makes me have to keep the volume at like 5 or it gets too loud.

It turns the onboard amp on/up, which is needed for the 598s because of their high impedance. You should have it on and just use windows volume control if its too loud for you.

Quoted from EmilioEstevez

[…]

http://puu.sh/7979O.png

One last tip, the HD598s have high impedance so you will need to use the internal amp and set Exciter mode and 8 channel audio on to get the best out of them.

those setting are in the xonar card or some drivers or something ?