The question mark is how perfect the read from a CD will be to the sound card. So, for example, if I have a sound file on the computer, then the card should be able to deliver the exact sound file to the DAC. I guess that, from the sound card to the DAC, I am probably good because the word clock will give a bit-perfect transfer. A very high-end DAC with a word clock output and precision internal clock.A high-end RME sound card with a word clock module.A high-end CD transport without a word clock.Since in DirectSDM the volume is fixed, I suppose at 0dB, where as through modulators (DirectSDM unticked), due to my HQP settings the volume goes to -3dB.I am aiming to get bit-perfect rendering of audio CDs and wondering about the necessary configuration. Of course ! Et voila, now this explains the “lost bass” effect even better. With this new treasure finding it seems to my hearing and therefore brains (or rather what is left of it) that IIR + wide + ASDM5EC 256 sounds better (that is to say, fullier, richier and somewhat “cleaner”) then IIR + wide + ASDM7ECv2 128, this is especially noticable with SDM64 source material, less so for PCM.īut secondly, after switching back and forth between DirectSDM and ASDM5EC/256 or ASDM7ECv2/128 modulators’ options, I started to notice a volume difference. Thus I found out, to my hughe surprise, that I can upsample SDM64 to 256 with ASDM5EC (v1) with no staggering (aaalmost **) ! I wonder if this comes with optimisations in your latest embedded release !? Following your preference example I switched to IIR integratior, but also decided to experiment if there’s anything worthy 256x that my system can do. My passively cooled NUC source, based on i7-8665U, could not perfom 7EC modulators 256x without staggering. Hi wow ! many thanks for taking your time to reply !įirstly, I learned something today - I have totally missed that filters do not apply to DSD sources! Uff… a bit long description, sorry, but repeating the question again:Īny experience / recommendation on top SDM to SDM upscaling ? Any thoughts on above? It’s quite interesting that I do not strongly notice the weakening of bass with PCM conversion to SDM in the combination of filters I’m using. But in upscaling to DSD128 (ok, similar result 256 and 512) quite noticeable part of low range is lost. In bit perfect DirectSDM HoloAudio May + HQP are delivering the rich bass. One obvious feature however is that IIR3 takes very long time to start playing.Īfter this « DM » experiment I went to some reference testing records for acoustic systems setup, the one I like the most in SACD format is « Are You Authentic » from Stockfisch Records (SFR 357.9011.2)Īgain two of « low bass » compositions (3. Playing with integrators i think makes changes to sound, but not getting to the same mellow richness of the bass as with DirectSDM. I took a note that I had « FIR » integrator in set-up. The bass reproduction was very obviously much weaker !
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