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)