d_elm Posted January 26, 2017 Share Posted January 26, 2017 Below is output from spek. This is a 176.4 purchase from acoustic sounds that looks to me to be 44.1 uprezed. Can anyone comment on what they see here ? Link to comment
Axiom05 Posted January 26, 2017 Share Posted January 26, 2017 Below is output from spek. This is a 176.4 purchase from acoustic sounds that looks to me tobe 44.1 uprezed. Can anyone comment on what they see here ? [ATTACH=CONFIG]32819[/ATTACH] I'm going to take a stab at this: it looks to me like a DSD file that was converted to 24 bit, 176.4 KHz. The spectrogram shows the high frequency noise of Delta-Sigma modulation. Main System: [Synology DS216, Rpi-4b LMS (pCP)], Holo Audio Red, Ayre QX-5 Twenty, Ayre KX-5 Twenty, Ayre VX-5 Twenty, Revel Ultima Studio2, Iconoclast speaker cables & interconnects, RealTraps acoustic treatments Living Room: Sonore ultraRendu, Ayre QB-9DSD, Simaudio MOON 340iX, B&W 802 Diamond Link to comment
d_elm Posted January 27, 2017 Author Share Posted January 27, 2017 I'm going to take a stab at this: it looks to me like a DSD file that was converted to 24 bit, 176.4 KHz. The spectrogram shows the high frequency noise of Delta-Sigma modulation. Thank you for the DSD suggestion. I can get close to the spectrogram I posted in #1 if I do the following conversions: 44.1 -> DSD64 -> DSD128 -> 176.4 Any chance the spectrogram in #1 comes from an analog -> DSD128 -> 176.4 conversion ? The cutoff at 22k is puzzling to me for such a conversion. Link to comment
Jay-dub Posted January 27, 2017 Share Posted January 27, 2017 I agree, the most likely signal chain is 44.1 -> DSD -> 176.4. It's definitely been put through a 22kHz lowpass, but their are tools that will do that even when running at higher sample rates (e.g. AUI). The only way to know for certain that it has been through a 44.1kHz stage is if you see aliasing around 22 kHz, which I don't see here, so that's inconclusive. An analog source is an interesting idea. Analog tape doesn't drop off that abruptly, but I have downloaded recordings sourced from analog that I thought sounded better when I lowpassed them, reducing the hiss and distortion associated with tape at high frequencies, so maybe a transfer engineer followed that logic and did analog -> DSD (with 22kHz lowpass), followed by the conversion to 176.4. As to the noise from DSD, it's much higher for DSD64 than DSD128, so I would not expect to see a difference between DSD64 -> DSD128 -> 176 compared to DSD64 -> 176. Link to comment
firedog Posted January 27, 2017 Share Posted January 27, 2017 I suggest you write Acoustic Sounds with your specific concerns and details (in brief). My experience with them is that they take such enquiries seriously, even going to the label and asking about the source of the file. Main listening (small home office): Main setup: Surge protector +>Isol-8 Mini sub Axis Power Strip/Isolation>QuietPC Low Noise Server>Roon (Audiolense DRC)>Stack Audio Link II>Kii Control>Kii Three (on their own electric circuit) >GIK Room Treatments. Secondary Path: Server with Audiolense RC>RPi4 or analog>Cayin iDAC6 MKII (tube mode) (XLR)>Kii Three . Bedroom: SBTouch to Cambridge Soundworks Desktop Setup. Living Room/Kitchen: Ropieee (RPi3b+ with touchscreen) + Schiit Modi3E to a pair of Morel Hogtalare. All absolute statements about audio are false Link to comment
audiventory Posted January 27, 2017 Share Posted January 27, 2017 Below is output from spek. This is a 176.4 purchase from acoustic sounds that looks to me tobe 44.1 uprezed. Can anyone comment on what they see here ? [ATTACH=CONFIG]32819[/ATTACH] Looks like DSD converted to PCM. Don't pay attention to visible range of musical spectrum. It depend on recording/mixing/mastering. Upper spectrum (20+ kHz) we can see tone. It may be as recording equipment issue as processing issue. Since 70+ kHz noise suppressed by filter of DSD demodulator, probably. AuI ConverteR 48x44 - HD audio converter/optimizer for DAC of high resolution files ISO, DSF, DFF (1-bit/D64/128/256/512/1024), wav, flac, aiff, alac, safe CD ripper to PCM/DSF, Seamless Album Conversion, AIFF, WAV, FLAC, DSF metadata editor, Mac & WindowsOffline conversion save energy and nature Link to comment
mansr Posted January 27, 2017 Share Posted January 27, 2017 Below is output from spek. This is a 176.4 purchase from acoustic sounds that looks to me tobe 44.1 uprezed. Can anyone comment on what they see here ? [ATTACH=CONFIG]32819[/ATTACH] Looks like playback of a 44.1 kHz source with the analogue output captured at DSD64, then converted to PCM. Why anyone would do this is beyond me, yet they do. Link to comment
Axiom05 Posted January 27, 2017 Share Posted January 27, 2017 Looks like playback of a 44.1 kHz source with the analogue output captured at DSD64, then converted to PCM. Why anyone would do this is beyond me, yet they do. 2xHD take a 24/96 PCM file, convert it to analog and pass it through a tube preamp while converting it to DSD, and this qualifies to be sold on NativeDSD, go figure... Main System: [Synology DS216, Rpi-4b LMS (pCP)], Holo Audio Red, Ayre QX-5 Twenty, Ayre KX-5 Twenty, Ayre VX-5 Twenty, Revel Ultima Studio2, Iconoclast speaker cables & interconnects, RealTraps acoustic treatments Living Room: Sonore ultraRendu, Ayre QB-9DSD, Simaudio MOON 340iX, B&W 802 Diamond Link to comment
audiventory Posted January 27, 2017 Share Posted January 27, 2017 2xHD take a 24/96 PCM file, convert it to analog and pass it through a tube preamp while converting it to DSD Sound art. Enhancer. It is not quality (low distortions, fidelity) matter. AuI ConverteR 48x44 - HD audio converter/optimizer for DAC of high resolution files ISO, DSF, DFF (1-bit/D64/128/256/512/1024), wav, flac, aiff, alac, safe CD ripper to PCM/DSF, Seamless Album Conversion, AIFF, WAV, FLAC, DSF metadata editor, Mac & WindowsOffline conversion save energy and nature Link to comment
doankhuong92 Posted February 15, 2017 Share Posted February 15, 2017 I suggest you write Acoustic Sounds with concern and details (summary) of your specific. My experience with them is that they have such questions seriously, even go to the labels and ask about the source of the files. Link to comment
d_elm Posted February 15, 2017 Author Share Posted February 15, 2017 I did contact Acoustic Sounds about this with no reply. Sent from my iPad using Computer Audiophile Link to comment
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