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I was wondering if the uDAC-2 would be sufficient for these cans or are there other dac/amp combos around the same price that would work even better.
I've never owned the uDAC-2 (NWAVGuy's reviews turned me off), but from what I understand, they should be able to handle the FA-011s just fine. Of course, if you spend more you will likely get more, but that's a very deep rabbit hole. There isn't much in that price range (US$120 +/-), especially with a nice user experience (from what I could discern).
I went with the E7($90, or $200 for the E7/E9 combo), which also handles them well, though I'm not so happy with the user interface
for my purposes (primarily desktop use). I also considered the FUBAR III($230), Fireye II($100), EF2A($160), and at one point considered the Music Streamer II($150) paired with a Little Dot MK II($125) or MK III($200). Also considered the Sound Blaster X-Fi HD USB ($100) briefly. If I had a hard limit of the uDAC price, I think I might go with the X-Fi, which should drive the FA-011s while still providing a hassle-free user experience and hopefully without the channel balance issues of the uDAC.
Though my E7/E9 combo sounds very good and provides oodles of power, I don't like having to turn on my E7 independently, every time I turn on my computer. Then remember to turn it off independently as well. The little power button on the side is a pain to use while it's docked, and I don't always hold it long enough (since my hand blocks the screen when I do it, I can't tell). I also don't like that every time I turn my computer on, I'm recharging its internal battery. That thing is sure to be useless within a year or so, because of that.
If I could do it all over again, I think I'd suck it up and spend the money on a Music Streamer 2 and a stand-alone amp.
As an aside, I also picked up the Behringer UCA-202($30) and a Bravo V2 ($30-50) mini tube amp off of ebay. No complaints about the UCA-202 as a basic DAC, but it's anemic on its own. The Bravo amp is... cute. The sound's pretty good unless I do a head-to-head with better equipment. Definitely coloring, quite powerful, somewhat inconvenient input and power switch placement, but for a $40 amp, I'm not complaining.
Standard disclaimer: I'm more of a mid-fi than hi-fi guy. I mostly listen to 256-320kbps MP3s, in a relatively noisy environment, with no single piece of audio equipment costing more than $300, and am perfectly happy. I'm not rich enough to ignore the "diminishing returns" issue and would rather have my 80% of perfect for $150-300 than 90% for $1500. Since you're looking at the uDAC-2, I have to assume you're in the same camp!