OK. I have rolled back my ARES II to the original firmware.
My goodness. I have my old DAC back!
I listened to about 13 tracks before rolling it back and made extensive notes of vocal passages and instrument sounds.
I have to admit, some of the things I was hearing, I heard on both versions of the firmware. This is clearly the recording, the inherent "sound" of the DAC, or both.
BUT, as I annotated my notes on the new firmware with my notes on the old firmware, I kept writing "better, warmer". "Voice warmer". "Different; but better". "Yes, better, not as harsh, but vocals still a bit raspy".
Hi-hats and castanets (very short, discrete sounds) that sounded processed (like a low quality MP3 - that "underwater sound") were much more resolved, clearer and didn't suffer this issue. They sounded natural.
I noticed differences in male and female vocals. The old firmware was better.
On the whole, the listening is now much less fatiguing and less distracting. When the intensity of vocal passage increased, I almost winced on the new firmware. Now, it's intense - fine - but I am not wincing.
Have I lost anything? Maybe some of that "holographic" or "3D" sound. But to be honest, that sounded process/manufactured anyway. Unnatural you might say. Fun to listen to. But I'm not missing it.
Also, the clicking/popping when manually skipping between tracks playing on Qobuz thru the WiiM app (WiiM mini) is back again. The new firmware fixed this. This tells me my old firmware is back - which is good to verify. Am I annoyed? Nope. I can live with it.
All in all, I feel I'm ahead with the rollback.
I'd be interested in your thoughts.
Tracks tested:
John Denver - An Evening With John Denver (Live) - Take Me Home, Country Roads; Rocky Mountain High
Yaya Bay - Pour Up
KD Lang - Hallelujah
Khruangbin - Texas Sun
Frankie Knuckles - Your Love
Hot Sardines - St James Infirmary
Cecile' McLorin - Unquiet Grave
Dominic Fils Amie - Birds
Esther Philips - Whisper to a Scream; That's All Right With Me
George Harrison - My Sweet Lord (50th Anniversary)
Lana Del Ray - The Grants; Did You Know There's A Tunnel Under Ocean Blvd