Yes, but I assume these are temp controlled clockgenerators only.

Usually, but sometimes not only the clocks. E.g. Lavry's Gold:

"The PCM DAC is constructed of custom made laser trimmed thin film resistor networks; yet any resistor is subject to short term drift due to temperature variations and long term drift due to component aging. The resistor networks are kept at a constant temperature by a linearly controlled heating element. (A bang-bang controller, such as a home thermostat is undesirable because it produces turn on and turn off surges-- thus audible kicks.) Keeping the resistors at constant temperature overcomes resistor dependency on environmental temperature variations."

If all else fails, why not sell this as an Yggy accessory case:

I don't think either of those would be big enough... but maybe a tabletop pizza oven?

Those crossover blibs are just at -104dB and at a frequency of around 17kHz (for this test tone).
Judging from the waveform I figure it may not be possible to improve this using forward correction, perhaps using signed magnitude.

I'm surprised by the cross over distortion. I don't see it when measuring the outputs of my M7 (using Rigol DSO)... Will post a SS when I'm not posting from iPhone.

I'm not experienced on the matter, and the FFT measurements show all other signals other than fundamental are near noise floor. But I wouldn't of expected it in a device where fidelity is meant to be the main goal...

You won't see cross over distortion from your M7. Delta-Sigma recovery filters assure there won't be any such artifact. Part of their "charm". Look at Solderdude's comments again. This crossover distortion is in the last two bits of a 20 bit DAC at the zero-crossing only. It is above 17KHz in nature. It is far less audible (if at all) than jitter spectrum on many high-end DACs. I was hesitant to post this particular graph due to exactly this potential for mis-interpretation. I also have linearity graphs but am really hesitant to publish them for the same reason.

Bob, what other parameters/measurements (besides jitter) you feel are important to look at that correlate well with perceived performance?

Also, any reason to use WDM over ASIO for the measurements? (I'm not familiar with Yggy driver support nor the Prism, and that's what the screen captures seem to display)

Where the measurements done at -0.1 dBFS (4.something Vrms)?

Any higher rate measurements?

Thanks!

Bob, what other parameters/measurements (besides jitter) you feel are important to look at that correlate well with perceived performance?

Also, any reason to use WDM over ASIO for the measurements? (I'm not familiar with Yggy driver support nor the Prism, and that's what the screen captures seem to display)

Where the measurements done at -0.1 dBFS (4.something Vrms)?

Any higher rate measurements?

Thanks!

I'm not sure I'm the one to answer questions relating measured performance against perceptual performance. One of the reasons I obtained a dScope and several other rather expensive test bench items such as a Klippel analyzer and Keyence laser displacement meter. I am trying to figure this out for myself as part of my acoustic research.

I'm using the WDM drivers only because the dScope is finicky during USB sound card setup when using ASIO drivers and it takes a bit of fiddling to make it all play reliably. Using either AES/EBU or SPDIF is a breeze by comparison. But everyone wants to know about USB performance so that is what I am focused on initially.

There may be higher rate measurements later on. Setup, measurement and screen capture all take some time for each test. I haven't reached retirement or independent wealth, so my hours are filled performing acoustic research for a corporate entity. I'm hoping to catch any changes after 400 hrs of constant power on time this weekend. I missed the 200 hr mark as my corporate gig needed attention at that time.