Can you list the issues?
And list the errors? Otherwise it is a bit wishy washy statements 
The Cosmos ADCiso has been checked against an APx555
Ultimately if my multitone shows 120dB clean signal range (just an example - same logic applies to every measurement) I conclude that the DAC is at least this good. ie with a $30k or $100k analyser the DAC could even be better than I am seeing 
Although I already knew it likely wonât work, I still checked my CosmosADC to confirm.
Iâll just leave it at that, a wishy washy statement.
Well, I donât know if APx555 can used for the purpose either. But I guess you mean it has been tested only through spectrum analysis.
This is another spectrum analysis case.
Its all a bit cryptic which makes technical discussion quite confusing.
Anyway for the measurements I do it shows differences between DACs in great resolution between DACs (for those measurements).
I can see the differences between a D200 and AH90 and Spring3 - for those measurements
I have a friend in Japan with APx555, we are in an international whatsapp group of DSD Direct DACs enthusiasts and he did set of AH90 measurements with APx555 (same measurements I do, same test tiles) and get same results as my Cosmos ADCiso + Scaler combo under 100kHz - he is quite shocked given price difference. Iâm pretty happy with that
I guess my measurements are riddled with issues and in future Iâlll just keep my future measurements to our whatsapp group general users here can trust the DAC marketing and their ears 
Sure, but those are all same category of measurements.
Yeh over the last 10+ years these are mostly the same category of measurements youâve been posting.
I doubt you think they are useless otherwise youâve been posting useless content ?
In addition to your Pico and IMD and 1kHz and J-test plots youâve shared, Iâve added a few more âinspiredâ by ASR, with multitone and IMD vs level, one of the more interesting ones.
To me if a DAC nails all these , it correlates to great sound quality (in my personal experience).
To write it another way : Iâve yet to have a DAC that nails all these and sounds crap 
So in that sense, the Cosmos combo is quite excellent. I Canât see a long list of âissuesâ and âerrorsâ for this set of measurements, the same youâve been sharing publicly for so long?
The original Cosmos ADC that you have as bigger ESS IMD hump than the negligible new ADCiso. One reason I will redo some of my measurements. Cosmos Scaler fixes the impedance issue. As long as you use it correctly, use a powerbank to power Scaler and separate powerbank for ADCiso , per the designers recommendation
I have full understanding for Jussi not sharing the intricate details of his measurement suite. After all he is the developer of HQ Player, a commercially sold product. It cannot be expected of him to share his IPR that forms an essential part of his product. Jussi has been extremely helpful in this forum. In my view it is fully up to him to chose to which extent he wants to disclose information.
Not useless, but not related to DAC correction.
Iâve been posting those as well.
Did you ended up buying it?
I returned the K13 today. Even though it can do 1bit direct DSD, the noise floor and clicking was insane on them.
Hoping others can test to see if my experience is a one off but this is my first time having this issue with a AMP/DAC in over 15 years.
Might just have to go with the Cyan 2 at this point or pick up an AKM Eversolo.
Sad 
I donât know if Eversolo has implemented DSD Direct mode on their AKM devices. So worth considering this if you are seeking for a DSD Direct device.
New Ifi iDSD phantom can go DSD 2048 @jussi_laako
Maximum inputs it can take are 768k PCM and DSD512 though. It has some internal upsampling to âDSD2048â which in this case means it is running four DSD1793 DAC chips at DSD512 in interleaved mode. This is same way they did âDSD1024â earlier.
Accuphase has been doing this interleaving approach for at least couple of decades. They do it also in the DAC-60 card.
So the âDSD2048â in this case is not useful in scope of this thread (as it is supported input rate nor native).
Audalytic AH90: what a DAC for Native DSD listening 
My MA RX8 are saying thank you
Allegedly, this will have Native DSD to DSD 512. Weâll see in February.
What is the best way to determine how many bits to send the DAC? I have a Fiio K11 R2R, which recently got an update enabling native DSD support. I currently have the Bits settings at â20â, but I have no idea if thatâs optimal.
Which is the exact model of the CUI medical grade PSU that Jussi recommends for use with Raspberries?
Not specifically for RPi but:
For 5V devices in general SDM36-5-U-P5
For 12V devices in general SDM65-12-U-P6
The setting is only relevant for PCM output mode, it doesnât apply to DSD outputs.
The way to determine initial value is to check linearity sweep measurement result and find the place where it begins to deviate from straight line, and then convert the dB value into corresponding word length (bits). Then the exact value can be iterated further by playing sine at -120 dB level and looking at the THD measurement results. There shouldnât be any harmonic components present and level of the fundamental should be exactly -120 dBFS.
