When the modulators were first provided there were DAC/computer combinations whose response would become unstable with the B modulators, so the A modulators were available as a fallback. I havenāt experienced this instability or read about anyone else doing so in the past several years, but someone who has an older DAC/computer that is having issues with DSD might conceivably look at trying the A modulators to see whether they make any difference.
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Iām just posing the rational argument against investing development time for the inclusion of such a superfluous feature element to Audirvanaā¦ Why do you think it is such an important function to add to Audirvana when there are other ways that you can up-sample your library of DSD64 or DSD128 content to DSD256?
Please point us to the reference material that you base these statements onā¦ Please show us what an A, B or C modulator isā¦
@Jud @matt @Reynaldo ā¦ Within this overview there are links to specific topics regarding Sigma Delta Modulatorsā¦
From the Texas Instruments technical tutorial libraryā¦
Sigma Delta Modulator Overview
You keep trotting this graph outā¦ How does this prove the ultra-sonic information is audibleā¦?
The graphs are describing the difference in the PCM up-sampling modulation filters in Audirvana but does not specify whether this is SoX or r8Brain related
This does not describe the nature of modulation of DSD64 or DSD128 files to DSD256.
@Jud
Thank you, you always bring important information.
Iām using the B8 modulator and itās perfect for DSD.
In another topic I will describe how it worked, the setting I left, the test I did with MQA and a test with a DSD512 disc.
ā
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So when you use AudirvÄna to convert PCM to DSD128, rather than using Yuriās converter on all of your PCM files individually, you are irrationally using a superfluous feature element?
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@Jud
Thatās what I wrote to him earlier.
And more, if there is no difference from DSD64 to DSD128, what is the reason for the conversion?
The problem is the more we respond, the longer the discussion gets.
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Yes, our friend keeps arguing we shouldnāt do the very same things he does (modulating to a higher DSD rate, doing so inline rather than offline), and it does make one wonder why.
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Are you always so insipid? 
I decimate stereo DSD64, stereo DSD128 and stereo DSD256 to PCM 24/352.8KHzfiles using Bit Perfect āDSD Masterāā¦ The only reason I decimate stereo DSDxxx files is so I can apply HRTF DSP via Audirvana plug-in architectureā¦ 
Otherwise (and I am repeating myself once more for you folks 
) I play native binaural DSD64 and DSD128 natively as recorded and do not acquire DSD files that have been modulated to higher DSD sample-rates. Is this too hard to understand for you folks? Andā¦ I would not modulate DSD64 or DSD128 files to DSD256 using Yuriās system, as I donāt see the value in doing so.
(FYI)
The TEAC UD-501 max PCM sample-rate is 384kHz
Your screen
Yes it isā¦ This applies to all PCM files in my library which includes those DXD files I have created by decimating DSDxxx files.
So you do inline upsampling and modulation to DSD128 because the plug-in doesnāt work at PCM or DSD64 rates?
??? DSP cannot be applied to DSD filesā¦ If it is applied in post-production, the DSD file is decimated to DXD (PCM) 352.8kHz in DAWs like Pyramix or Sonoma and the DSP is applied to the DXD file and then modulated back to the original DSDxxx sample-rateā¦ In my case the decimation is done with DSD Master.
Simple question, why do you do inline upsampling to DSD128, as noted by you in the forum multiple times and as shown on your screenshot in this thread?
In the case of up-sampling/modulation of PCMxxx files, it is to the maximum sample-rate of the UD-501 (5.6MHz)ā¦ Even if my DAC supported 11.2MHz, I do not find good reason to do this PCMxxx ā DSDxxx modulation conversion to higher than 5.6Mz in Audirvana or via offline processingā¦ I perceive a tangible difference between PCMxxx modulated to DSD64 versus DSD128, but this really splitting hairs.
@Jud
Do as I say, but donāt do as I do. 
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You are conflating DSD64 modulation to a higher DSD sample-rate with modulating PCMxxx to DSDxxxā¦ These are two different contextsā¦
The more you explain, the worse it gets. 
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Sometimes it happensā¦ especially when the context is reframed unnecessarily to fit an insipid narrativeā¦