Popular Post barrows Posted May 4, 2016 Popular Post Share Posted May 4, 2016 I am almost sure this has already been discussed somewhere on CA, but can't happen to find it.Could someone point me to a thread where the advantages/disadvantages of DOP vs native DSD are discussed ? Thanks for you help As far as I am concerned the only "disadvantage" for DoP is that it requires high rate PCM capability for those who want to be able to playback high rate DSD files: DSD 64 requires a 176.4 PCM package, DSD 128 requires a 352.8 PCM package, and DSD 256 requires a 705.6 PCM package. Not a lot of DACs can do 705.6 PCM, so DSD 256 delivery is generally limited to Native DSD streams. Other than the above limitation, there is NO downside to DoP, as the "extra processing" required is negligible. "Packing" DoP is not like oversampling and filtering, which does require significant processing. I checked this on my Mac: using Jriver to send DoP DSD 128 required no more CPU activity than playing back native 24/96 PCM files. odelay, Matias and 4est 3 SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
barrows Posted May 4, 2016 Share Posted May 4, 2016 Thanks for those important infos. Is there a link explaining the "maths/physics" behind those numbers ? They remind me of the advice that transcoding a DSD64 to PCM is best done at a 176.4 frequency, DSD128 at twice that frequency, etc. (advice coming from minimserver author who has implemented such a trancoding possibility in his excellent software). Isn't there a small (or not so small) overhead inside the DAC (as opposed to the external music server) to recover the DSD signal from its DOP "camouflage" and which could impact SQ ? Thanks There is no reason to believe that unpacking (in the DAC) DoP would require anymore processing power than packing it (in the server) requires, and as I have mentioned, packing it requires virtually nothing in terms of processing power. There are no conversions involved or fancy maths (unlike digital filtering/oversampling), it is simple stuff. SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
barrows Posted May 4, 2016 Share Posted May 4, 2016 My point was that there are many DACs that support DoP via digital inputs, for example SPDIF inputs (like Chord, etc). I wondered where the marker was read in that signal path. Ted, there are only a small handful of DACs which allow DoP over SPDIF, like Chord. As these companies are also ones who typically do things their own way, I suspect that one would have to inquire directly with them. In any case, the actual processing required to unpack DSD is virtuually nil, no matter where it is done. creating I2S for the DAC out of a USB stream, for example in a USB receiver) requires so much more activity (100s of times more) that it is absurd in the extreme to suggest that unpacking DoP will have any effect whatsoever. Additionally, this is just another reason why manufacturers should use isolated USB receivers (from the DAC chip), to qualm somewhat crazy audiophile fears. SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
barrows Posted May 4, 2016 Share Posted May 4, 2016 Sorry for the "many" but our database has 40, and I have experienced it on several (yes, I do mean several) dacs inhouse, including 4 Chords, 3 Myteks, an MSB and one or two others. DACs like Chord, Mytek and MSB are pretty popular around here. So, no, I was not being hyperbolic. Hey Ted, no worries, that is actually a lot more than I was aware of! SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
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