The iPod headphone jack is extremely noisy...so that in combination with amping the noise up with the bithead and then hooking them up to ECH's which are the most sensitive type of headphones, will most likely result in lots of white noise. If you haven't already turn the gain switch on your bithead to the low position. The Senn's aren't as sensitive and so won't pick up all the white noise like that.
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Sources:Powerbook G4, iPod Touch 16GB
Headphones: SE530, Grado SR-60, UE Triple.fi 10
Amps: Tomahawk, '07 Micro
DACs: Phillips UDA1321, '07 Micro
Sold: E2c, E3c, Super.fi5pro, SE210
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