My FA-12 arrived in about 2.5 weeks.
Having spent more time with the Flux FA-12 I feel like I can give out some decent feedback.
Pi2aes with moode resampling to 176khz->Coax->Denafrips Ares 2 in NOS->Flux Fa-12 High Gain->LCD2C
Is a great pairing. Very smooth mid centered and detailed sound. Bass is still present, well extended and detailed. It’s a more textured and nuanced sound than a dynamic slam. The same set up with a thx 789 can come off as harsh in the treble. The FA-12 has detailed treble, but the mids seem to be the star of the show. The treble is more laid back for fatigue free listening, but with the FA-12 you don’t miss the treble at all. With the THX 789 and modi 3 I always missed the treble with these headphones and sometimes the treble came off as fatiguing even though it wasn’t that present. This is the best I’ve ever heard the LCD2C by a good margin.
Pi2aes->Coax->Denafrips Ares 2 in OS mode->Flux Fa-12->Anandas
Detailed, and airy with a little less bass slam than I was expecting. Mids are a little on the distant side. I was never able to hear height in the stage with the THX 789, but with the FA-12 the sound can sometimes be heard as coming from above your head. the stage is more filled out from center to left and right as well, but depth still alludes me somewhat. I might need to add a PEQ to increase the bass slam for the Ananda’s while the THX 789/Modi 3 did not need it. Bass is still well extended and textured, but just not as present as on the Schiit dac. Now I want to hear a bifrost 2 to compare, but aesthetically the Denafrips Ares 2 and Flux FA-12 are a great match. Ironically, the easy going treble of FA-12 seems to take away from the Ananda’s treble sparkle. The same can be said for my balanced modded KSC75. I’ll give this a bit more time for brain burn in. I might be too used to the THX 789 at this point.
The Flux Fa-12 is a superior amp to the THX 789 in most ways sonically. It’s less fatiguing, more detailed and has better channel balance. My 789 had a little channel imbalance at low volumes. However, the FA-12 does seem to deliver noticeably less power. I listen to both of my not very power hungry planars on high gain at around 11:00-12:00. If you’re looking for a really aggressive and in your face kind of sound I guess you could prefer the THX 789.
The biggest upgrade with the FA-12 was the elimination of my ground loop problem with the THX 789 paired with the Denafrips Ares 2 over balanced.
On a side note, I think the Denafrips Ares 2 is best used on speakers. The reverb it can provide seems a little wasted on headphones. Something to consider when it’s time to upgrade my stereo.