Are you going through any form of headphone amplifier? Those outputs were not intended to drive headphones, but I know a lot of people have had luck with smaller sets.
First, check your headphones by plugging them into another device. Check your empeg by plugging it into a line level amplifier or receiver, to see if you still get the noise. What kind of cabling are you using, and can you test the cabling by connecting it to a preamp out of another device?
Paul G.
SN# 090000587 (40GB Smoke)
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Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs