I looked into Asgard 3 because, to my ears, the Asgard 2 / Bifrost OG MB stack's sound always had a haze to it (and A3 is much cheaper than Bifrost 2 in terms of changing something out).
Comparing the AC power draw at idle (using Kill-a-watt P3 meter) A3 draws less power 12.1W / 15.6VA vs A2 at 22.8W / 28.8VA.
Hardware Chain: Old Sony DVD player, coaxial S/PDIF (generic RCA RG-59 coax cable) to Bifrost OG Multibit DAC, planar headphones ~16 ohms ~92 dB/mW efficiency.
A3 has less veiling of the mids compared to A2 (Dvorak's 9th Symphony). Instrument types (strings vs brass vs woodwinds, etc) are more clearly defined with A3, and position of the players (left vs right) is much better defined-- with A2 the soundstage was small and a bit flat sounding. A3 Highs are very fast but so far seem natural, and there is a warmth to the upper bass / lower mids that wasn't as noticeable with A2.
Using hi-gain setting for initial testing. So far, the A3 sounds very good. Unbelievable at the $199 price point.
Will update in a week or two after more auditioning with other types of music (vocals, jazz at the pawnshop, etc.)