After much experimenting with wiring, putting the pre-amp in/out of the loop, moving the balance all the way right and left to hear if the noise is on one side or the other (both, unfortunately), comparisons to other amps using the same tracks with/without the magic box in the loop, having two other people check a "noisy" track (thanks Chris and Craig), etc. I have concluded that the noise is created by the Millenia, but is only audible/discernable on a few songs. Otherwise the damn thing sounds incredibly good.
My willingness to live with this irritation and use the Millenia as my primary HP amp will depend entirely on how good the Odyssey Cyclops turns out to be, assuming Klaus and the elves ever finish it and deliver it (I've been a pretty good boy, I really have). I hope to get it before late December, but one never knows...
I will also talk to Jan Plummer from TBI in the next couple of days to see what he thinks. Maybe there's something wrong with this unit. Maybe the Millenia is just able to recreate noise that is actually in the recording when other amps can't. It certainly recreates music better than anything else I've had here so far. I'm listening to Abbey Road right now, and it sounds phenomenal. Full and rich without being bloated in any way. Very detailed, good instrument separation, decent sound stage, No harshness. Ever. Not even when playing Red Hot Chili Peppers. Really. Well, okay, as long as you turn down a few songs. I mean, how many high-fidelity amp/headphone combos allow you to crank RHCP at all without giving you a major headache? This little box is amazing. It makes most recordings sound better than I've ever heard them. It makes a few sound like crap.
I might get to a full write up this week. But from what I've written so far, you folks know how good I think the Millenia is. I don't think it is going back even if the Cyclops whups it. I'll probably keep both. I mean, this is a truly portable $500-600 speaker amp that runs on batteries, takes inputs from portable players (haven't tried that yet though) and puts $750-1000 headphone amps to shame. Except on a few tracks. Grumble.
Edited by Gary in MD - 7/14/13 at 9:06pm