So... If Chord DACs don't care about input jitter as per the FAQ, where does that leave us with source selection? Is a low jitter source like the Allo Digione a bad investment? Is a simple USB to optical adapter out of the iMac all you need since it eliminates RF noise? I'd love to hear some opinions on this before getting a source for my newly acquired Hugo and Mojo that I'll use with HD600s by the computer. I think the Mojo + HD600 in particular is a fantastic combo. No fatigue, just mid range resolution for days with velvety detailed top. It's the first DAC + headphone combo I've tried that reminds my of my old Harbeth P3ESRs that I sadly had to let go of.