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Pridružen/-a: Pon Feb 2009 19:27
Prispevkov: 1605
Kraj: kamnik

PrispevekObjavljeno: Pet Dec 02, 2022 23:23    Naslov sporočila: Odgovori s citatom

habo66

imaÅ” zs
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submat50



Pridružen/-a: Tor Nov 2009 18:05
Prispevkov: 613
Kraj: Ljubljana

PrispevekObjavljeno: Sob Dec 03, 2022 20:31    Naslov sporočila: Odgovori s citatom

Jaz sem se odloĆØal na podlagi tega opisa. Sem pa Qutest in moj Bifrost sliÅ”al na AB testu vendar ne na mojem sistemu. Prispevek zelo lepo opiÅ”e razlike. Na testu sem takoj sliÅ”al razliko in sem se odloĆØil zaradi razliĆØnosti in ne kateri je boljÅ”i.

Both are quite different sounding DACs. Qutest is leaner, not a lot of meat on the bones, a touch sterile sounding and canā€™t hit hard in the bass. Bifrost2 on the other hand is denser and warmer in the mids, has a more burly presentation that is very dynamic and punchy, but the presentation will come across as having a bit of murkiness next to the Qutest. Bifrost2 has amazing macro and micro dynamic character with plenty of texture in the mids. Qutest is more of a high resolution DAC with great separation and imaging. Both are incisive in the lower treble, but the Bifrost 2 is smoother in the upper treble, whereas, the Qutest is going to be overall touch brighter in the entire treble region. I hear the Qutest can be made smoother with a good power supply and source. For me, Bifrost2 has a more analog-like timbre in the midrange over the Qutest. As for the soundstage, Qutest is going to be airier with blacker background and a more effortless separation. But the depth is going to be quite similar on both.

Overall, I find the Bifrost2 more engaging and to my liking than the Qutest. My only issue with the Bifrost2 is itā€™s lower treble incisiveness, which is a touch more evident on headphones than on speakers. On speakers, not only is this lower treble incisiveness less evident, but also the midrange comes across even more life like than on headphones.
Ā 
Bifrost sem mislil prodat, pa ga Ŕe ne bom.

Lp Matjaž
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benma



Pridružen/-a: Ned Jan 2011 17:12
Prispevkov: 1533
Kraj: Kamnica

PrispevekObjavljeno: Sob Dec 03, 2022 21:00    Naslov sporočila: Odgovori s citatom

KakŔna je razlika (razen v letih) med Bitfrost in Bitfrost2, o katerem je govora v gornjem opisu.
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submat50



Pridružen/-a: Tor Nov 2009 18:05
Prispevkov: 613
Kraj: Ljubljana

PrispevekObjavljeno: Sob Dec 03, 2022 23:30    Naslov sporočila: Odgovori s citatom

Jaz imam Bifrost I multibit. V zgornjem prispevku pa je govor govor o Bifrost II.


https://www.head-fi.org/threads/schiit-bifrost-2-vs-chord-qutest.957606/

Kot piÅ”eje je II nov DAC ni neka nadgradnja. Se pa tadva DAC- ĆØisto na razliĆØni naĆØin tržita.

Moje mnenje:

Schiit se trži samo internetno in mislim da ima veliko "influecarjev" ali kao se temu reĆØe.

Cord pa ima moĆØan marketing prodajalci, revije itd.


Lp
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luka79



Pridružen/-a: Pet Mar 2011 15:36
Prispevkov: 1004
Kraj: Ljubljana

PrispevekObjavljeno: Ned Dec 04, 2022 11:09    Naslov sporočila: Odgovori s citatom

submat50 je napisal/a:
Jaz imam Bifrost I multibit. V zgornjem prispevku pa je govor govor o Bifrost II.


https://www.head-fi.org/threads/schiit-bifrost-2-vs-chord-qutest.957606/

Kot piÅ”eje je II nov DAC ni neka nadgradnja. Se pa tadva DAC- ĆØisto na razliĆØni naĆØin tržita.

Moje mnenje:

Schiit se trži samo internetno in mislim da ima veliko "influecarjev" ali kao se temu reĆØe.

Cord pa ima moĆØan marketing prodajalci, revije itd.


Lp


Kdo bi si mislil, ane Laughing

Glede na to, da je Schiit ameriÅ”ki, Chord pa angleÅ”ki... 3/4 hi-fija je marketinÅ”ki bias. Sploh ĆØe bereÅ” WHF, je vse angleÅ”ko top shit Laughing
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benma



Pridružen/-a: Ned Jan 2011 17:12
Prispevkov: 1533
Kraj: Kamnica

PrispevekObjavljeno: Ned Dec 04, 2022 11:29    Naslov sporočila: Odgovori s citatom

Ko smo že pri DACih. DAC je neke vrste raĆØunalnik, ki dokaj hitro zastari. Zato je pred nakupom potreben temeljit razmislek.

KakŔen mora biti po vaŔem mnenju v digitalno prihodnost usmerjen DAC? Ali naj bo del kombinirane naprave ali samostojna naprava, MQA da/ne (streaming, Tidal, ...), najnovejŔi formati zapisa, zaželeni vhodi/izhodi, ...
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submat50



Pridružen/-a: Tor Nov 2009 18:05
Prispevkov: 613
Kraj: Ljubljana

PrispevekObjavljeno: Ned Dec 04, 2022 17:22    Naslov sporočila: Odgovori s citatom

Moje videnje. Nisem se ravno zelo poglobil v DAC-e tako, da me bo lahko kdo poravil. Prvi DAC-i so imeli zelo dobro zasnovo in bi bilo s razvojem pristopa zvokovno rezultat zelo dober. Razvoj in izdelava pa sta bila drage. Razvoj je Å”el v smer moĆØnih chip-ov ala Sabre itd. katerih izdelava ni bila tako draga rezultat pa slabÅ”i. "Tržilo" se ni zvok temveĆØ chip itd. Vmes so se pojavili padalci kot Schiit multibit, Chord, Å”e en zanimiv R2R dac z vrsto zelo preciznimi upori. Nek Danec sem pozabil ime. Seveda pa so tuÅ”e pregreÅ”no dragi DAC, ki jih pa ne poznam. Kdor je med Å”tudijem spoznal Shannon teorem je mislil, da je pa to to. Sedaj pa vsak DAC poje po svoje.

Moj razvoj sistema. Jaz sem imel približno 1000 CD in CD player. Vse sem poripsal in dal na zunanji disk in ga priklopil na Mac mini CD pa v Å”katle in v klet. Sistem z iTunes in iPhone kot dalincem.CD sem prodal in kupil rDAC. Ko sem se naroĆØil na Tidal sem oboje tako mojo bazo kot Tdal podtaknil Audirvani, zopet dalinec iPhone. Potem sem CD-je prodal (razen klasike) prodal star gramofon in kupil dober nov gramofon in phono. Tukaj sem sedaj.

Å e odgovor na vpraÅ”anje. Jaz imam raje sisteme, kjer so funcije razdeljene po enotah. To omogoĆØa veliko fleksibilnost. NaĆØeloma naj bi bolje kljubovale ĆØasu so pa dražjie kot pa enote ki imajo združene veĆØ funkcij. Seveda pa je tukaj vpraÅ”anje koliko daleĆØ se misliÅ” spustiti v to HiFi igro.

Lp
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LightBit



Pridružen/-a: Pon Okt 2017 23:11
Prispevkov: 2365
Kraj: Kranj

PrispevekObjavljeno: Ned Dec 04, 2022 20:33    Naslov sporočila: Odgovori s citatom

Streamer zagotovo zastari hitreje kot DAC, ampak Å”e vedno je lahko bolj praktiĆØno in ceneje v kompletu menjati. Tudi class D ojaĆØevalci kar zastarijo.

Pa saj avdiofil se naveliĆØa naprav pa mora menjati že zaradi spremembe same.
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joztom



Pridružen/-a: Pon Jan 2013 11:07
Prispevkov: 1946
Kraj: Ljubljana

PrispevekObjavljeno: Pon Dec 05, 2022 18:06    Naslov sporočila: Odgovori s citatom

S kolegom sva si privoÅ”ĆØila dopoldansko veselje in preposluÅ”ala oba DACa, tako starejÅ”ega Bifrosta kot novega Chord Qutest v veĆØ Å¾anrih. Sem že prestar in ne veĆØ tako briljantnega sluha za ocenjevanje vrhunske tehnike, vseeno lahko povem, da se je dalo jasno sliÅ”ati razliko. Vrhunski sistem iz DAC-a, Audio Research predojaĆØevalca, dveh monoblokov Quad 306, zvoĆØnikov Quad 57, dveh REL subwooferjev, je trdna podlaga za resen zvok, ki ga posreduje namenski iMac preko networka in Audirvana playerja. Novi DAC je glede na starega, ki mu vsekakor tudi niĆØ ne manjka, za korak natanĆØnejÅ”i, pinpoint pozicioniranje inÅ”trumentov in vokalov je opazno, bas je bolj natanĆØen, suh, nekako globlji in bolj prezenten. AB primerjave pa ne dajo kar direktnega zmagovalca, tudi stari Schiit Bifrost ponuja po drugi strani nekako mesnatejÅ”i, živ in polnejÅ”i vokal in nekatere inÅ”trumente. Pri novem DAC-u bi si zaželel displaya, ki bi kazal parametre signala, tako pa le barve dveh tipk oznaĆØujejo razliĆØe vhode in FIR filtracijo. Tukaj je Å”e veliko za raziskovat in možne so Å”e izboljÅ”ave zvoka. Vedno sva posluÅ”ala USB vir. Vsekakor je Å”e odprta možnost prilagoditev na boljÅ”i, namenski USB kabel in testi razliĆØnih RCA povezav naprej. Ampak prvi test za pokuÅ”ino, vrhunsko. Za poglobljen test FIR filtrov pa je potreben kakÅ”en dodani tweeter na Quad 57, ki ga proti 10k zmanjka.
Se Å”e spomnim uvodnih tednov na svojem Toppingu, da sem ob prijazni pomoĆØi soforumaÅ”ev postavil dokonĆØno zrel zvok, tako nastavitve za DSD driverje v Foobar2000, Tascam-HR playerju in nastavitve bufferja. Windowsi so malo drugaĆØni od iMaca.
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submat50



Pridružen/-a: Tor Nov 2009 18:05
Prispevkov: 613
Kraj: Ljubljana

PrispevekObjavljeno: Sob Jan 28, 2023 10:32    Naslov sporočila: Odgovori s citatom

V test sem dobil vrhunski DAC proizvajalca CHORD in sicer Hugo TT2
z M-dcaler-em. Primejala ga bova s Chord Qtest in Burson
Conductor V1. Vse tri bova primerjala samo kot DAC na sistem z zvoĆØniki. Hugo TT2 in Conductor V1 imata tudi predojaĆØevalec za sluÅ”alke zato ga bova primerjala tudi to. Uporabljene bodo sluÅ”alke Grado SR325e Sennheiser HD660S sem žal že prodal. Tudi Burson Conductor V1 prodajam zato bo test tudi zelo zanimiv. Interkonekt med DAC om in predojaĆØevalcem je Esprit Beta francoskega proizvajalca. Napisal sem bova, seveda bo svoje mnenje podal tudi Jože.

VeĆØ o Chord napravah najdete na njihovi spletni strani. KakaÅ”a pa je funkcija M-Scalar-ja pa je zelo dobro opisano v naslednjem prispevku. Za tiste, ki ne boste brali celotnega prispevka, na koncu je kratko o M-scalarju.

For audio purposes, as @ProfFalkin has said, we usually refer to ā€œupscalingā€ as ā€œupsamplingā€ - and sometimes as ā€œoversamplingā€. These terms are often used interchangeably, although a more proper application of them would be that ā€œoversamplingā€ means sampling at a higher rate than Nyquist for the source signal and ā€œupsamplingā€ means performing a sample-rate-conversion (SRC) from one already-sampled source to a higher rate.
While both ā€œoversamplingā€ and ā€œupsamplingā€ work to solve a similar problem, specifically to make it easier to implement the necessary filters for sampling (brick wall/anti-imaging) and replay (reconstruction), the first is applied at capture time in the ADC and the second by the DAC (though there are some DAC architectures which also do internal ā€œoversamplingā€ earlier in their conversion steps).
If you sample a normal audio signal at 44.1 kHz, which is the CD standard, you need a brick-wall filter that absolutely ensures no audio information is passed to the ADC with a frequency higher than 22,050 Hz (otherwise youā€™ll get images - i.e. false data - lower in the audio band). If you want a flat response from 20 Hz to 20 kHz, then that means you have to attenuate the input from 0 dBFS to -96 dBFS over just 2,050 Hz. If you oversample the input at, say, 176.4 kHz, for the same audio content, your filter now simply has to go from 0 dBFS to -96 dBFS over a span of 66.1 kHz (88.2. kHz - 20 kHz). Which is a much shallower curve and easier (and cheaper) to engineer reliably.
Remember that the input filter operates in the analog domain as it must occur prior to the signal reaching the ADC!
Thereā€™s a decent overview 25 of it, with illustrations and examples, here 25. And Iā€™m happy to get into a detailed discussion on specific aspects of it as needed/desired.
________________________________________
It is worth noting that many DACs, and in particular delta-sigma designs, already do their own upsampling - whether you want them to or not (though some allow you to choose if it happens, and sometimes by how much)!
Schiitā€™s entire multi-bit line over-samples (for Yggdrasil it is to 8x ā€¦ or 8 fs - where ā€œfsā€ is the base sample rate, so 44.1 kHz input gets upsampled to 352.8 kHz), Chordā€™s DACs do an even more extrema upsampling, in two stages, for example with DAVE first to 16 fs and then by a further 256 fs.
These DACs also use proprietary filters (ā€œSuper Combo Burritoā€ for Schiitā€™s line, ā€œWatts Transient-Alignedā€ for Chordā€™s for example). A typical filter, built into a DAC chip, might use 256 ā€œtapsā€. When you see references to ā€œtap lengthā€ or ā€œfilter lengthā€, each ā€œtapā€ is a specific conversion coefficient, and the longer the filter the more likely you are to get to conversion coefficients of zero. Higher sample rates require longer filters (more taps) to do this. There is no benefit to having a million-tap filter on raw 44.1 kHz (non-upsampled) content, as the vast majority of the taps will have a zero coefficient.
________________________________________
From a less theoretical effect, letā€™s talk about actual application and software - per the questions in the original post.
Upsampling can, indeed, be done in software. In fact for both macOS and Windows, if you set the output rate to your audio device (e.g. via the Audio Midi Utility on macOS) to a higher rate than the source material being played, then the OS will upsample the content on the fly.
This is generally NOT a desirable thing as you have no control over how this upsampling is done, and there are multiple approaches, filters and levels of precision that can be applied, which have different implications and potential artifacts - the built-in OS upsampling generally isnā€™t as good as dedicated software.
Of note, here, is what happens by default in Android-based systems. Androidā€™s standard audio-stack assumes a sample rate of 48 kHz. Any source material not at a multiple of 48 kHz undergoes sample-rate-conversion. For example, standard streaming content, CD content, and most compressed audio will be resampled from 44.1 kHz to 48 kHz. This is a non-integer conversion, which makes the math and precision much more involved (and critical) than a simple powers-of-two conversion (e.g. 48 kHz -> 96 kHz).
More precise conversions and filters (e.g. an ideal sinc filter) are more demanding in terms of power (batter) and CPU, than is ideal for a cellphone, and as a result those sample-rate-conversion implementations are optimized for power rather than quality. Thus we want to avoid that conversion in the device if we can, and this is one reason why Android-based DAPs sometimes tout having a custom-audio stack to bypass this process.
ā€¦
Going further ā€¦
On a Mac or a PC, there are myriad ways to do upsampling in software. Many high-end music-player applications allow you to enable upsampling, and they generally implement much more sophisticated schemes than youā€™ll find built into the OS.
Audirvana+ 10, for example, allows you not only to specific many of the details of how the upsampling is performed, and to what degree, but even allows you to choose between two different upsampling engines, ā€œSoXā€ (open source) and ā€œiZotopeā€.
If you want more control, and even more sophisticated approaches, including control over things like filter type, tap-length, noise-shaping (required by all 1-bit, delta-sigma and DSD conversions), then you want to look at "ā€œHQPlayer 12ā€.
Most conversions, at sane upsampling rates, can be done easily on the fly. However, extreme upsampling and the resulting long, complex, filters and noise-shapers you want to apply there, are VERY processing-power intensive. HQPlayer, for example, converting 44.1 kHz PCM to DSD512, and then using the highest fidelity poly-sinc filter and high-order noise-shaping, will required a dedicated multi-core computer (or significant GPU compute capacity) to work, and even then can have significant startup-latency.
________________________________________
Hardware up-samplers/filters originated when the required processing was more than was easily accommodated on reasonably priced general purpose hardware/computers. Most of that is now handled by software in the real-world (either on the computer, on a basic DSP chip in the DAC).
Extreme hardware up-sampling, and in particular the necessary filtering and noise-shaping you must apply to get the benefits of it, still requires serious processing power (as per the HQPlayer example above). This is where things like Chordā€™s M-Scalers come in ā€¦ as they use a massively-parallel DSP approach to do both the upsampling and then the complex filtering and noise-shaping over very long tap length filters.
The Chord Hugo M-Scaler, which is to my knowledge the most advanced and extreme hardware audio upsampled/filter available, uses an FPGA that provides 740 DSP cores, and utilizes 528 of those in parallel to upsample to 4096 fs before applying a 1,015,808 tap implementation of Rob Wattā€™s ā€œWTAā€ filter, and reducing the final output rate to something the DAC can handle (upto 768 kHz in the case of Chordā€™s newer DACs). And even with such powerful hardware on tap, this incurs about a 1.4 second latency. And the result of this is effectively an ideal implementation of a sinc-filter that optimally recovers the originally sampled data for material up to 44.1 kHz and 16-bits, and gets closer than anything else Iā€™m aware of for higher rates and bit-depths.
________________________________________
So, short version - you can experiment with upsampling (and filtering) in software. Doing so to a high degree requires special software and powerful hardware. And otherwise you can look at various hardware options, the highest-spec of which is, today, the M-Scaler. From there the rubber-meets-the-road as you start to consider the audible effects of this processing vs. what it means in terms of math, theory and the demands/easements it enables on the actual hardware implementation.

Å e dve fotki. Hugo TT2 z M-Scalarjem:



In Celota:



Matjaž
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submat50



Pridružen/-a: Tor Nov 2009 18:05
Prispevkov: 613
Kraj: Ljubljana

PrispevekObjavljeno: Sob Jan 28, 2023 12:19    Naslov sporočila: Odgovori s citatom

Å e dosedanji vtisi posluÅ”anja. ƈe bi si lahko za HiFi privoĆØil tak znesek bi bil Hugo tt2 z M-Scalar-jem pod "must". V tem primeru bi resno razmislil ali potrebujem gramofo, seveda ĆØe izvzamemo obred, obĆØutek, ki ga doživimo ob pripravi in posluÅ”anju LP-ja. Seveda pa je vpraÅ”anje kako bi se odloĆØil, ĆØe bi imel boljÅ”i gramofon in phono.
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ambasador



Pridružen/-a: Sre Feb 2011 19:52
Prispevkov: 5984
Kraj: Izola

PrispevekObjavljeno: Sob Jan 28, 2023 13:34    Naslov sporočila: Odgovori s citatom

Ni poanta kaj je boljÅ”e in kaj najboljÅ”e. Pomembno je samo ali ti daje užitek in zadoÅ”ĆØenje.
ƈe ja, potem se ĆØimprej losaj gramofonske navlake in ploÅ”ĆØ. Nekomu boÅ” naredil veselje, sebe pa odreÅ”il ritualov. Notranji mir je pomembnejÅ”i od predsodkov, dilem, stalne skrbi in poslediĆØnega avdiofilskega stresa kaj je najboljÅ”e.
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luka79



Pridružen/-a: Pet Mar 2011 15:36
Prispevkov: 1004
Kraj: Ljubljana

PrispevekObjavljeno: Sob Jan 28, 2023 19:09    Naslov sporočila: Odgovori s citatom

ambasador je napisal/a:
Ni poanta kaj je boljÅ”e in kaj najboljÅ”e. Pomembno je samo ali ti daje užitek in zadoÅ”ĆØenje.
ƈe ja, potem se ĆØimprej losaj gramofonske navlake in ploÅ”ĆØ. Nekomu boÅ” naredil veselje, sebe pa odreÅ”il ritualov. Notranji mir je pomembnejÅ”i od predsodkov, dilem, stalne skrbi in poslediĆØnega avdiofilskega stresa kaj je najboljÅ”e.


Genau.
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dabiblo



Pridružen/-a: Pon Mar 2017 14:27
Prispevkov: 153
Kraj: Zasavje

PrispevekObjavljeno: Sob Jan 28, 2023 21:52    Naslov sporočila: Odgovori s citatom

Si kdo lasti ali pa je imel možnost sliÅ”ati Geshelli J2 (AKM) DAC? Vem, da nima input ekranĆØka, usbja brez doplaĆØila ipd. a mene tisto ne bi motilo, ker uporabljam zgolj en input in tisti ni usb.
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ambasador



Pridružen/-a: Sre Feb 2011 19:52
Prispevkov: 5984
Kraj: Izola

PrispevekObjavljeno: Ned Jan 29, 2023 12:05    Naslov sporočila: Odgovori s citatom

uuu, si me spomnil:

Asahi Kasei aka AKM je nedolgo tega predstavil novo linijo ĆØipov:
https://www.akm.com/eu/en/about-us/news/2022/20220420-ak4499ex/
-------------------------------------------------------------------------
Opomogli so si po požaru. Italijani komentirajo, da bo trajalo preden se bodo kupci tako masovno zanesli na njih kot je to bilo pred požarom.
Vsi so se opekli, na vrat na nos so morali preprojektirati dac-e v svojih izdelkih, ko je AKM odpovedal.
Prav ta požar je dal vedeti kako tvegano je sloneti samo na enemu dobavitelju. Veliko se jih je potem orientiralo na R2R dac-e, zato da so neodvisni, oziroma nabavljajo material kjerkoli.
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