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XXHighEnd > Ultimate Audio Playback > XXHighEnd Support > SQ of WAV vs M4A
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Author Topic: SQ of WAV vs M4A  (Read 22010 times)
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CoenP
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« Reply #15 on: February 11, 2014, 12:37:12 am »
Now that checksum will tell you if they are completely identical. If you're only one sample off (even one byte) than the checksum will not be the same. This is the difficulty, you cannot know how your rip is comparable to the presumably unripped ' cloud'  version. They have to be from the same source AND have the same start and end samples. So no padding or truncing allowed...otherwise you'll end up with an unequal checksum even if the music is 100% the same.

I'd say only the CD ripping process gives reproducible results unless there is some smart checksum that is able to match the actual music data with a reference regardless of padding/truncation.

On a more DIY track you could align the two datasets on peak values in a (hex) file or music editor (pick a channel and search for nice extremes) than you can observe if the dataseries before and after the peak are exactly the same. Of course with the absolute sample magnitude. If not: they will not be equal enough to sound the same!

regards, Coen
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Settings: Qn: , SFS: , timeres: XT tweaks: , buf: 4096, driver: 8 ms,

Audio PC (jan 19): XXHE PC v1 with RAMdisk w.o. videocard and 1 of 2 cpu fans + BRIX/USB3 storage musicserver. ETN to Fibre converters (linear supplies), 500m SFP modules & 5m OM4 cable. Power cable PE not connected, together with nos1 and poweramp in separate "audio" powerstrip.

Clarixa set + Intona (or Lush 1m), Phasure NOS1a-75B G3 USB (buf 16 ms)-> Blaxius ->SE EL95 (0,8W triode) + cheap link to Abaqus 300W plateamps> Bastanis cable-> Bastanis Sagarmatha Duo ("DIY").

[other sources: TD124/3009SII-i/Grace F9/lounge LCR phono; Rega Planet 1997 vintage]
christoffe
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« Reply #16 on: February 11, 2014, 04:16:20 pm »
Another graph from a CD and an ITunes track (256kbps). The WAV of the iTunes record was created with the internal device.
It is here very well to see, that the frequency was cut reduced to well below 20KHz.

Peters remark about the "Virus program" is ............ .

Joachim

* CD-Ritenour.png (785.83 KB, 800x500 - viewed 872 times.)

* iTunes Riteneour.png (780.58 KB, 800x500 - viewed 760 times.)
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PeterSt
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« Reply #17 on: February 11, 2014, 05:15:32 pm »
Joachim,

I am glad you can see/confirm that "well below 20KHz". But I don't see it or don't know where to look. sorry

Regards,
Peter
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christoffe
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« Reply #18 on: February 11, 2014, 07:04:02 pm »
Quote from: PeterSt on February 11, 2014, 05:15:32 pm
Joachim,

I am glad you can see/confirm that "well below 20KHz". But I don't see it or don't know where to look. sorry

Regards,
Peter

In the middle of the .............. .

* Scale01.png (278.76 KB, 446x840 - viewed 740 times.)
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PeterSt
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« Reply #19 on: February 11, 2014, 07:11:15 pm »
I must be thick ...
So you like riddles eh ? Too difficult for me.
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For the Stealth III LPS PC :
W10-14393.0 - July 17, 2021 (2.11)
XXHighEnd Mach III Stealth LPS PC -> Xeon Scalable 14/28 core with Hyperthreading On (set to 14/28 cores in BIOS and set to 10/20 cores via Boot Menu) @~660MHz, 48GB, Windows 10 Pro 64 bit build 14393.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/0/0/*1*/ Q1Factor = *4* / Dev.Buffer = 4096 / ClockRes = *10ms* / Memory = Straight Contiguous / Include Garbage Collect / SFS = *10.13*  (max 10.13) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / Stop Desktop, Remaining, WASAPI and W10 services / Use Remote Desktop / Keep LAN - Not Persist / WallPaper On / OSD Off (!) / Running Time Off / Minimize OS / XTweaks : Balanced Load = *62* / Nervous Rate = *1* / Cool when Idle = n.a / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = Optimal / Time Stability = Stable / Custom Filtering *Low* (16x) / Always Clear Proxy before Playback = On -> USB3 from MoBo -> Lush^3
A: W-Y-R-G, B: *W-G* USB 1m00 -> Phisolator 24/768 Phasure NOS1a/G3 75B (BNC Out) async USB DAC, Driver v1.0.4b (16ms) -> B'ASS Current Amplifier -> Blaxius*^2.5* A:B-G, B:B-G Interlink -> Orelo MKII Active Open Baffle Horn Speakers. ET^2 Ethernet from Mach III to Music Server PC (RDC Control).
Removed Switching Supplies from everywhere (also from the PC).
For a general PC :
W10-10586.0 - May 2016 (2.05+)
*XXHighEnd PC -> I7 3930k with Hyperthreading On (12 cores)* @~500MHz, 16GB, Windows 10 Pro 64 bit build 10586.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/1/1/1 / Q1Factor = 1 / Dev.Buffer = 4096 / ClockRes = 1ms / Memory = Straight Contiguous / Include Garbage Collect / SFS = 0.10  (max 60) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / All Services Off / Keep LAN - Not Persist / WallPaper On / OSD On / Running Time Off / Minimize OS / XTweaks : Balanced Load = *43* / Nervous Rate = 1 / Cool when Idle = 1 / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = *Optimal* / Time Stability = *Stable* / Custom Filter *Low* 705600 / -> USB3 *from MoBo* -> Clairixa USB 15cm -> Intona Isolator -> Clairixa USB 1m80 -> 24/768 Phasure NOS1a 75B (BNC Out) async USB DAC, Driver v1.0.4b (4ms) -> Blaxius BNC interlink *-> B'ASS Current Amplifier /w Level4 -> Blaxius Interlink* -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere.
Global Moderator
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