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FredericV

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About FredericV

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  1. FredericV

    MQA is Vaporware

    Some years ago I took a 24/96 file which I considered one of the best guitar demo tracks ever, and ran that through foobar with and without DSP. The DSP was: downsample it to 16/44.1, and upsample it back to 24/96 - both with secret rabbit code. I was doing the A/B on the fly by switching the DSP on and off in foobar, on a set which included a big Vitus amp and a big pair of Marten speakers on some hifi show. Nobody could hear the diff. I later did another experiment with the same file, where i used sox with highest settings, to create a "cd filtered" 24/96 version, and posted this on some internet fora. Both files were 24/96 files, but one had downsampled to 16/44.1 + upsampled back to 24/96 content from the original, in order to eliminate any sound differences by the DAC. Nobody except one hifi dealer claimed to hear the difference. One listener cheated by opening the files with an audio editor and looking at the spectrum. The content of that file was produced by Mark, so yes I believe him as I did a similar experiment. So why go for hi-res? Not for the sound quality of hi-res itself, but for the fact that most likely more effort was put into the production as it is geared towards those who want quality. And thus recording & better mastering leads to better sound quality ...
  2. FredericV

    MQA is Vaporware

    This reviewer is not really a big fan of MQA. Differences between MQA and SACD were very small, so how can we be sure it's not a difference between the used components? e.g. and old SACD player vs a much more recent DAC. https://audiophilereview.com/cd-dac-digital/a-comparison-of-sacd-vs-mqa-in-physical-format.html Some interesting comments from Mark Waldrep below the article. Going to attempt Mark's challenge http://www.realhd-audio.com/?p=6197
  3. FredericV

    Is 100 Mbit/s Ethernet enough for audio?

    With current AV standards, you can saturate 100mps with 4K blu-ray content, which peaks up to 128mbit: https://en.wikipedia.org/wiki/Ultra_HD_Blu-ray Streaming 4K like netflix & youtube has a much lower bandwidth and a 100mbps LAN will not be the bottleneck. Any consumer PCM or DSD format should be peanuts when you only have 100mbps bandwidth!
  4. FredericV

    Is 100 Mbit/s Ethernet enough for audio?

    No need for gigabit for DSD: DFF size (MBytes/min) DSF size (MBytes/min) SACD size (MBytes/min) DSD64 stereo 20.5 20.5 20.5 DSD64 multichannel (5.1) 61.6 61.6 - DSD128 stereo 41.1 41.1 - DSD128 multichannel (5.1) 123.2 123.2 - DSD256 stereo 82.1 82.1 - DSD256 multichannel (5.1) 246.3 246.3 - DSD512 stereo 164.2 164.2 - DSD512 multichannel (5.1) 492.7 492.7 - DSD1024 stereo 328.5 328.5 - DSD1024 multichannel (5.1) 985.4 985.4 -
  5. FredericV

    MQA is Vaporware

    It's not used in the studio to "save"' project files. It's an export format, like saving your video project to a lower bitrate youtube version ready for upload. MQA is not an archival format or mastering format - but a lossy export format where you lose data, and all you get is the right to listen to an approximation of the master when you own some form of decoder software or hardware.
  6. FredericV

    MQA is Vaporware

    Not in it's current form, where it's limited to the equivalent of 17/96 + upsampling with weak filters which have aliasing. Like redbook with one octave of added ultrasonics + upsampling. I recently showed MQA's impulse response to a befriended engineer, and his first reaction was: that must have a lot of aliasing !!! This person was not even a die hard audiophile. Anything above 16/44.1 these days is called hi-res My theory why they use weak filters: you get fake content above the 1x rate, and most likely they try to use a touch up signal to compensate for the diff with the real signal (as shown in the patent), but as this is a lossy process, there are still parts of the spectrum which they mess up, as shown by @mansr recent plots. I could be wrong, as the actual inner workings of MQA remain partially secret, but my gut feeling says this is why they use such weak filters. SOX can also create similar "fake" content, but it misses the touch up, so it creates even more aliasing as MQA if you use the filter setting with one cycle of postrining (it's somewhere in this thread) :
  7. FredericV

    MQA is Vaporware

    and virtualy no MQA enabled AD converters ! If MQA was such a big thing and a new paradigm, why didn't the PRO brands jump on MQA? If end-to-end was real, we would see more AD's with some MQA features. But it has been proven MQA is not end-to-end, it's not the quality, not the master & not authenticated.
  8. FredericV

    MQA is Vaporware

    He is a joke: No quack devices are going to replace real acoustic treatments. Does not understand physics either, and thinks this arc distance can do 1 million volts:
  9. FredericV

    MQA is Vaporware

    Please do! You endorse MQA & listen to crypto DRM'ed files with an artificial higher noise floor which are never better than 17/96, then use grounding devices as you believe it lowers the noise floor. Hahahaha Same excuse as Peter Veth who was banned and came back via fake accounts. Admitted in the secret MQA group he was using fake accounts.
  10. FredericV

    MQA is Vaporware

    ;)
  11. FredericV

    Combined server/players?

    432 EVO Essence http://432evo.be/
  12. FredericV

    MQA is Vaporware

    They will come up with the excuse that mobile still has a limited data allowance ( like a few gigabyte up to ~ 20 gigabyte / month) and countries with slow internet like ADSL. In any case listening to redbook flac will easily consume > 1 gig for 3 albums, so you will reach a typical monthly mobile plan even without MQA easily. WIth MQA the flac size doubles as it can't compress the crypto DRM'ed part which is non-nyquist data and just does not fly with flac. For slow ADSL it does not matter, even the slowest connections can do flac hi-res. Throw in an entropy optimizer / noise blanker and you even need less bandwidth, e.g. https://www.xivero.com/xifeo/
  13. FredericV

    New HDPLEX 200W LPS

    ATX also specifies negative voltages on the connector: https://www.electronics-tutorials.ws/blog/convert-atx-psu-to-bench-supply.html Pin 12 and 18
  14. FredericV

    Best power supply for 3A 5V DAC

    it's the same with the Minix player which I mentioned, which officially is bundled with a DC 5V, 3A adapter but under normal use it won't require 3 amps! the multi-test from alpha audio is interesting because it just confirms we hear differently maybe he listened after measuring, forming his conclusion based on what he already saw on the analyzer
  15. FredericV

    Best power supply for 3A 5V DAC

    sbooster botw mk2 In my case I use it to power a raspberry, our microtik haplite show router on 432 EVO shows and this 4K player in our home cinema: http://minix.com.hk/products/neo-u9-h
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