RME User Forum — Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (KSTR) — Fri, 07 Jun 2019 21:01:14 +0000

^
https://www.forum.rme-audio.de/viewtopi … 36#p141736

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (hpw) — Fri, 07 Jun 2019 17:58:44 +0000

regarding: FPGA firmware 192 should fix both issues and provide perfectly looking LSB presentations. Note that this is not an official release, that one will come later, together with other goodies.

When will this happen?

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (KSTR) — Fri, 08 Mar 2019 14:23:07 +0000

OK, I finished some measurements with the new beta firmware and can confirm the problem has been fixed:
https://www.audiosciencereview.com/foru … ost-157421

Big thanks to Mathias and the whole RME team for the excellent and professional way this small issue has been handled!

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (dir) — Thu, 07 Mar 2019 10:56:06 +0000

Perhaps I am mistaken, but I do not insist on my opinion. This is just an 'first impression' (which is often true). In any case, the blind test involves the serial downloading of the new update, and in such a way that I was not aware of. It's easier for me to stay on the old firmware and wait for the official update.

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (KSTR) — Thu, 07 Mar 2019 08:29:39 +0000

As of now, I don't seem to hear any sonic differences with the new FW.

And, @dir, you have to update your knowledge about blind testing. Blind test does *not* mean a short piece of music is used over and over, nor does it mean there is any other significant "test stress". One can integrate long-term blind testing seamlessly into the usual recreational listening experience and once you do that you will get meaningful results with high resolution.

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (dir) — Wed, 06 Mar 2019 22:25:24 +0000

I know about this argument, but the method of blind test with a grueling repetition of one piece of music is completely different from the usual listening experience. With the help of a blind test, you can "prove" the absence of a difference between 24bit lossless and 320 kbs mp3 audio. But this experiment does not mean that there are no differences between them.

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (RME Support) — Wed, 06 Mar 2019 18:26:34 +0000

Without a scientific double-blind test of two different devices with different firmware, any comment on "sound quality" remains speculation, really...

Regards
Daniel Fuchs
RME

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (dir) — Wed, 06 Mar 2019 16:36:08 +0000

"the correct one" where? on the LSB level only?
I don’t know exactly which part of the signal processing was covered by the reprogramming of the FPGA. Perhaps this is an anti-placebo, but the sound of the beta firmware seemed more "sluggish." And this is despite the fact that before that I had updated the firmware and did not notice any degradation of the sound.

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (MC) — Tue, 05 Mar 2019 17:21:56 +0000

That is both weird - your post and your logic in it. Let's just assume the atomic-small changes of audio data in this firmware are audible - isn't it logical then that the 'new' sound is the correct one, and you should not go back to the broken one?

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (dir) — Tue, 05 Mar 2019 14:08:50 +0000

I know it sounds weird but beta firmware make some minor changes with sonic sinature of adi-2
(i was made update during playing music)
so i decide to go back to official 185/90

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (MC) — Tue, 05 Mar 2019 09:35:43 +0000

We do not plan to disclose that one. It was only mentioned as explanation why it took so long.

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (hpw) — Tue, 05 Mar 2019 09:19:17 +0000

>> Once we fixed this issue we found another one

What bug is/was this one, so we know the difference for testing, while no release notes given.

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (MC) — Mon, 04 Mar 2019 17:48:56 +0000

Sorry that it took so long. Once we fixed this issue we found another one - and that one was very time consuming in testing and fixing. FPGA firmware 192 should fix both issues and provide perfectly looking LSB presentations. Note that this is not an official release, that one will come later, together with other goodies.

https://archiv.rme-audio.de/download/fu … ro_192.zip

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (KSTR) — Tue, 26 Feb 2019 16:22:32 +0000

I know, and that's OK, RMS is not needed anway. Peak levels is what would matter here.

Re: Adi-2 Pro FS: minor processing issue (1LSB asymmetric offset error)

null@example.com (MC) — Tue, 26 Feb 2019 13:34:14 +0000

The unit does not measure or show RMS, only peak.