HiFiBerry Digi2 Pro Impressions

dllmsch · Jun 11, 2021

Marv said: ↑

AVERLAB to Gungnir A2 (XLR output measured)

RED = toslink out -> toslink out
BLU = SPDIF out -> BNC in
GRN = AES out -> SESCOM -> BNC in

View attachment 26586

In theory, we cannot hear any of this (I normalized a -6db 12kHz signal to 0dbFS - we can't stuff 110db down from that). I don't have the Unison USB board on the Gungnir, but I'm pretty use it would measure better than any of the below. Unison has been spectacular with respect to jitter / sidebands. However, I prefer the sound of AES from a good source over Unison.

Now if I wanted to pull something outta my ass, on the hypothesis that these primitive (and they are very primitive) measurements may allude to other behaviors (observed subjective phenomena) not yet measurable (i.e., someone hasn't invented the measurement yet).

Toslink sucks ass. There are two big sidebands - too high and too far away, near the edges of the graph. There are also two smaller sideband pairs. The result is this: sounds like ass.

BNC is OK. Lots of little sidebands all over the place, but not anywhere nearly as high or far away as the big Toslink sidebands. As a result, the sound is more grainy, more disjointed compared to the below.

AES-adapter-BNC is arguably "better" because its sidebands are close to the fundamental and low in level, on par with the BNC results. Maybe there's some smearing to the sound that makes it smoother or warmer. However, one could prefer the BNC on the account that the sound may be more focused.

Would I even stake $10 on my hypothesis. Nope. There's just not enough information. However, could it possible that what the folks have observed about an AES-> BNC adapter having a different sound over the other inputs is not imaginary? Yep.
Click to expand...

I wonder what a wider X-axis will show, perhaps some nasty peak down at 5k or somewhere else? I guess we can always ADDA for some real audible difference at the end of the day, the chinese audiophiles have been doing this for years to compare dacs.

HiFiBerry Digi2 Pro Impressions

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