Update
Received the Gungnir with multi bit upgrade today. Going on 7 hours since putting it back in the system.
On first getting the Gungnir installed, put Peter Gabriel’s "So" (CD ripped as ALAC file to external hard drive) on repeat from the Aries Mini (USB >>V-Link 192>>DH Labs D-750>>SPDIF Gungnir).
In the first few minutes after starting playback, things sounded noticeably brighter and somewhat harsh and "tizzy". Put the amp on mute and just let the file play through the Gungnir and Freya.
Started listening in earnest 6 hours later. Treble tizziness and harshness were gone. Improvements I noticed vs stock Gungnir:
Wider sound stage
Greater clarity...micro details better defined
Cymbals sound a lot more metallic and "shimmery" for lack of a better adjective
Percussive sounds have a firmer edge to them
Front to back depth is a little more evident
A bit more "heft" to the music (e.g., plucked strings)
Liked the Gungnir before the upgrade. Like it even more now. Hoping there’s further sonic "blossoming" with more hours. If it stays as it is, that’s okay too.