Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-18 Thread opaqueice

Themis;350875 Wrote: 
> But I strongly disagree about your distortion level example : If a lot
> of people can hear differences between -say- different speaker cables
> or even between microphones, although CCIR/ITU-R ABX tests prove that
> no-one hears any differences of that level anyway, then, probably, the
> famous ABX tests methodology is broken and/or there's a factor that we
> forgot to consider.

Eh?

jeffmeh;350956 Wrote: 
> At the risk of opening up the classic objectivist/subjectivist black
> hole, I have never understood this argument.
> 
> With all due respect, if:
> 1) A specific individual claims he can hear the difference between A
> and B when he knows which one he is hearing, and
> 2) That individual cannot differentiate A from B in an double-blind
> test, and
> 3) This scenario is repeated every time, for many tests, with many
> individuals, and
> 4) Countless studies across disciplines have demonstrated that the
> placebo effect is real
> 
> Then why is it reasonable to conclude that there is something wrong
> with the tests, rather than that none of these individuals can really
> hear the difference?

Seconded.  You seem like a reasonable person, Themis - can you
elaborate?


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-18 Thread DCtoDaylight

Themis;350875 Wrote: 
> I happen to know some high-end amplifier designers, and I can tell you
> that when they go as far as 100kHz and 0,001% and 0dB frequency
> responce deviation (although the... tests say that no-one hears
> differences of 0,1dB), it is not for marketing purposes. 
> It is because the sound of their product is better with than without.
> Go figure.

Ok, maybe I was generalizing a bit  Sometimes it's marketing, and
sometimes there's something else going on.

Some designers just push the 0.001% distortion for marketing reasons,
but others get there for the right reasons.  If you get there by
designing amps with huge open loop gains, so that you can apply a ton
of feedback, you're designing for marketing reasons.  If you work hard
at designing a circuit that has very low open loop distortion, and
apply a small amount of feedback for stability, then you're designing
for sonic reasons.  And I agree that the second amp design will sound
better.  My point is that the numbers alone give you an incomplete
picture, and are often misleading.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-18 Thread jeffmeh

Themis;350875 Wrote: 
> I get your point and Pat's one. But I strongly disagree about your
> distortion level example : If a lot of people can hear differences
> between -say- different speaker cables or even between microphones,
> although CCIR/ITU-R ABX tests prove that no-one hears any differences
> of that level anyway, then, probably, the famous ABX tests methodology
> is broken and/or there's a factor that we forgot to consider.
> Also, I happen to know some high-end amplifier designers, and I can
> tell you that when they go as far as 100kHz and 0,001% and 0dB
> frequency responce deviation (although the... tests say that no-one
> hears differences of 0,1dB), it is not for marketing purposes. 
> It is because the sound of their product is better with than without.
> Go figure.

At the risk of opening up the classic objectivist/subjectivist black
hole, I have never understood this argument.

With all due respect, if:
1) A specific individual claims he can hear the difference between A
and B when he knows which one he is hearing, and
2) That individual cannot differentiate A from B in an double-blind
test, and
3) This scenario is repeated every time, for many tests, with many
individuals, and
4) Countless studies across disciplines have demonstrated that the
placebo effect is real

Then why is it reasonable to conclude that there is something wrong
with the tests, rather than that none of these individuals can really
hear the difference?


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-18 Thread Themis

pfarrell;350879 Wrote: 
> 
> Yeah, its really sad. Its true that CD sales have been crushed.
> Whether that is due to piracy or crappy acts is hard to tell. But the
> revenue drain is terrible.
> 
> The record labels have always been a bit of a ponzi scheme, or if you
> prefer, a VC fund. They invest in a bunch of groups, most do nothing,
> and a few are Led Zepplin. But without the money from the big groups,
> there is no money to support the little ones.
> 
> The RIAA does not represent the recording industry. They represent the
> big five labels. Period.
> 
> But when there is a big squeeze, everyone from artists, session
> musicians, recording engineers, studio owners, etc. get crushed.
> 
> Except for a handful of studios (Apple Records, etc.) the only way
> studios are paying for the lights is voice overs, books on tape, and a
> few cats and dogs.
> 
> The only part of the business that has any current upside is vinyl.
> Most
> of that is yet another re-issue of ancient stuff. And its mostly sold
> to
> wacky audiophiles who think $10K is a decent price for a cartridge.
> 
> The current The Absolute Sound has a cover story on a turntable that
> weighs 600 pounds.
> Perhaps I'm a bit hi-jacking this thread, I apologize, but there MUST be
a solution, isn't it ? I mean, this is not a -production- model problem,
groups and musicians are as talented today as they were -say- 30 years
ago, studios are at least as good (at least I think) so... what is left
? The commercial business model and the customers. Is there a severe
inadequation between them ? 
Looking around me, people who like music still continue buying records.
The others don't, but they never did anyway. 
Perhaps the RIAA model, the way you describe it, is dead ? Is the
industry prepared to survive without it, according to you ?


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread Pat Farrell
Themis wrote:
> These are awful news, Pat. I didn't realize the situation was so
> desperate... :(

Yeah, its really sad. Its true that CD sales have been crushed.
Whether that is due to piracy or crappy acts is hard to tell. But the
revenue drain is terrible.

The record labels have always been a bit of a ponzi scheme, or if you
prefer, a VC fund. They invest in a bunch of groups, most do nothing,
and a few are Led Zepplin. But without the money from the big groups,
there is no money to support the little ones.

The RIAA does not represent the recording industry. They represent the
big five labels. Period.

But when there is a big squeeze, everyone from artists, session
musicians, recording engineers, studio owners, etc. get crushed.

Except for a handful of studios (Apple Records, etc.) the only way
studios are paying for the lights is voice overs, books on tape, and a
few cats and dogs.

The only part of the business that has any current upside is vinyl. Most
of that is yet another re-issue of ancient stuff. And its mostly sold to
wacky audiophiles who think $10K is a decent price for a cartridge.

The current The Absolute Sound has a cover story on a turntable that
weighs 600 pounds.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread Themis

pfarrell;350845 Wrote: 
> 
> And why would you buy a decent mic with their ADC? What if you don't
> want PCM, and rather want DSD? You'd be locked in.
> 
> In more general terms, it makes zero sense to buy a new Neumann mic,
> period. The music industry is a disaster, and the recording studio
> business is nearly dead. Commercial recording studios are selling for
> less than the value of their recording lockers (mics alone) with no
> value at all being placed on the studios, mixers, and value of the
> ongoing business.
> 
> If you want a Neumann mic, there are tons of barely used ones
> available
> for fire sale prices.
> These are awful news, Pat. I didn't realize the situation was so
desperate... :(


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread Themis

DCtoDaylight;350839 Wrote: 
> And if no one can hear distortion levels of less than 0.1%, why does
> gear go down to 0.001%?  In a word, marketing!  
> I think that what Pat is saying, is that many highly respected, great
> sounding mic's are actually quite limited by audiophile standards, and
> that the ability to reproduce ultra high frequency harmonics is not, by
> itself, a good indicator of sound quality.  
> The extra headroom a higher sampling rate brings is more useful for
> simplifying the anti aliasing filters, than it is for reproducing those
> high frequencies.I get your point and Pat's one. But I strongly disagree 
> about your
distortion level example : If a lot of people can hear differences
between -say- different speaker cables or even between microphones,
although CCIV/ITU-R ABX tests prove that no-one hears any differences
of that level anyway, then, probably, the famous ABX tests methodology
is broken and/or there's a factor that we forgot to consider.
Also, I happen to know some amplifier designers, and I can tell you
that when they go as far as 100kHz and 0,001% and 0dB frequency
responce deviation (although the... tests say that no-one hears
differences of 0,1dB), it is not for marketing purposes. 
It is because the sound of their product is better with than without.
Go figure.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread Pat Farrell
Themis wrote:
> Although I'm not an expert in
> microphones (so I can't really discuss with you) recent Neumanns DO
> record over 20kHz. Nobody buys them ?

Actually, nobody buys them, but that is not causal.

Neumann has a bunch of "digital" microphones, based on the TLM 103
series, and the KM18* series. They make zero sense. If you want to plug
a mic into your computer, say to record a podcast, you don't need a Neumann.

And why would you buy a decent mic with their ADC? What if you don't
want PCM, and rather want DSD? You'd be locked in.

In more general terms, it makes zero sense to buy a new Neumann mic,
period. The music industry is a disaster, and the recording studio
business is nearly dead. Commercial recording studios are selling for
less than the value of their recording lockers (mics alone) with no
value at all being placed on the studios, mixers, and value of the
ongoing business.

If you want a Neumann mic, there are tons of barely used ones available
for fire sale prices.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread DCtoDaylight

Themis;350743 Wrote: 
> And, if there's no material over 20kHz, why do monitors go up to 30kHz ?
> And why amplifiers go well over 50kHz ?

And if no one can hear distortion levels of less than 0.1%, why does
gear go down to 0.001%?  In a word, marketing!  
I think that what Pat is saying, is that many highly respected, great
sounding mic's are actually quite limited by audiophile standards, and
that the ability to reproduce ultra high frequency harmonics is not, by
itself, a good indicator of sound quality.  
The extra headroom a higher sampling rate brings is more useful for
simplifying the anti aliasing filters, than it is for reproducing those
high frequencies.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread Themis

pfarrell;350733 Wrote: 
> While there are measurement mics that go well up to 30kHz, the lust for,
> "musical mics" typically start rolling off as low as 15kHz.Well, rolling off 
> is not cutting, is it ? They are below normal level
but still there, am I mistaken ? Although I'm not an expert in
microphones (so I can't really discuss with you) recent Neumanns DO
record over 20kHz. Nobody buys them ?
And, if there's no material over 20kHz, why do monitors go up to 30kHz
? And why amplifiers go well over 50kHz ?


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread pfarrell

This is a screen capture of the specs page for the Telefunken ELA 251
microphone.
http://www.telefunkenusa.com/products/Ela%20M%2025x%20Manual.pdf

Notice:

1) it has no attempt to describe the frequency response over 15kHz.
2) the slope of the response from about 11kHz to 15Khz is clearly
negative
3) the slope shows a huge and rapid fall off of response above 13kHz


+---+
|Filename: telefunken_ela_251.jpg   |
|Download: http://forums.slimdevices.com/attachment.php?attachmentid=6056|
+---+

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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread Pat Farrell
Themis wrote:
>How's that: "nothing there" ? There're plenty of harmonics "there"...

Recorded by what microphone? feeding which preamp? Into which compressor?

While there are measurement mics that go well up to 30kHz, the lust for,
"musical mics" typically start rolling off as low as 15kHz.

See Neumann M50, Telefunken 251, RCA R44

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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread Themis

pfarrell;350717 Wrote: 
> Recording at 88.2 kHz means you don't need
> filters until 40kHz, and since there is nothing there, the filters can
> be nice first or second order networks.How's that: "nothing there" ? There're 
> plenty of harmonics "there"...


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread Pat Farrell
Themis wrote:
> BTW, if you look back in CD history, 25 years ago, almost everybody was
> saying (and proving it with various useless ABX tests) that it was
> impossible to hear any difference above 44.1kHz. And now, the same
> people are "serving" us 192kHz oversampling dacs saying (with the same
> aplomb) that the sound is much better. Go figure.

Pretty easy.

Early CDs (and digital mastering gear) had wicked low pass filters to
eliminate anything over 22kHz. They screwed up too many things to list.

With a 44.1kHz sample rate, there is nothing above 22.05 kHz. Period. No
wonder ABX tests failed.

Too many folks confuse this. Recording at 88.2 kHz means you don't need
filters until 40kHz, and since there is nothing there, the filters can
be nice first or second order networks.

I've never hear any serious reasons to justify quad rate sampling.

Bob Katz, a very serious mastering engineer, says that 18 bit samples at
55kHz would actually be enough, but with the way computers work, the
next logical step is 24 bits @ 88.2


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-17 Thread Themis

mvalera;350470 Wrote: 
> I think he's saying that the difference between the oversampled 48 and
> the true 96 is nigh impossible for most people to hear... because
> modern DACs are very good.  Not that the difference is useless.
> 
> He does say that true 96 files "would typically have superior sonic
> characteristics".
> 
> MikeI had understood. Well, you're probably right, but... my "audiophile"
tendency pushes me to minimize compromise whenever I can. If I can.

BTW, if you look back in CD history, 25 years ago, almost everybody was
saying (and proving it with various useless ABX tests) that it was
impossible to hear any difference above 44.1kHz. And now, the same
people are "serving" us 192kHz oversampling dacs saying (with the same
aplomb) that the sound is much better. Go figure.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-16 Thread opaqueice

Timothy Stockman;335301 Wrote: 
> Good luck finding something with a dynamic range of greater that 144 dB.
> 

Even if you had it, you couldn't use it.  The volume necessary to make
the -144 parts audible would destroy your hearing on the loud parts. 
Human ears simply can't handle that much dynamic range.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-16 Thread mvalera

I think he's saying that the difference between the oversampled 48 and
the true 96 is nigh impossible for most people to hear... because
modern DACs are very good.  Not that the difference is useless.

He does say that true 96 files "would typically have superior sonic
characteristics".

Mike


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-16 Thread Themis

Timothy Stockman;335301 Wrote: 
> The main useful difference between 48 KHz and 96 KHz is that 96 KHz can
> use a reconstruction filter with a much gentler slope, which would
> typically have superior sonic characteristics. Modern DACs achieve most
> of the benefits of higher sampling rates by using oversampling digital
> reconstruction filters.
You seem to say that half of the _real_ samples are useless in 96kHz,
and that they could as well be calculated. 
That's really strange, don't you find ? Perhaps we should downgrade to
24kHz ? or -still better- 12kHz ? :)


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-10-16 Thread IceFusion

for Linux users, the easiest method I've found is to:

1) de-flac the files using the flac command-line frontend
(http://flac.sourceforge.net/documentation_tools_flac.html,
Debian/Ubuntu package "flac").

2) use the sndfile-resample frontend for the Secret Rabbit Code (aka
samplerate) converter (http://www.mega-nerd.com/SRC/, Debian/Ubuntu
packages "samplerate-programs" and "libsamplerate")

both tools are batch-friendly.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-09-01 Thread Timothy Stockman

sarwaz;334668 Wrote: 
> As far as I can understand, in order to see any difference between 24/96
> and 24/48 you will need to use a original sound that has much more
> dynamic range than 24 bits, so when quantizing to 24 bits, you will be
> able to create much better dithering with 96Khz than 48Khz...
> 
> regards.
Good luck finding something with a dynamic range of greater that 144
dB.  Typcially dither is not applied to 24-bit files, as the quantizing
distortion on such a file is buried far beneath the noise floor.

The main useful difference between 48 KHz and 96 KHz is that 96 KHz can
use a reconstruction filter with a much gentler slope, which would
typically have superior sonic characteristics.  Modern DACs achieve
most of the benefits of higher sampling rates by using oversampling
digital reconstruction filters.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-08-31 Thread sarwaz

As far as I can understand, in order to see any difference between 24/96
and 24/48 you will need to use a original sound that has much more
dynamic range than 24 bits, so when quantizing to 24 bits, you will be
able to create much better dithering with 96Khz than 48Khz...

regards.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-02-12 Thread Phil Leigh

It's generally held (at least by me!) that 24/44.1 is not really that
much different to 24/48 or 24/96. 

24/44.1 is a bit better than 16/44.1 - even though we probably only
actually get a usable 20/44.1 in practice.

And yes...I've used all these formats extensively in the studio and I'm
not deaf :o)


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-02-12 Thread Stoker

Redil

seanadams;249720 Wrote: 
> 48 is the max, and the dac and s/pdif are driven together.

Sean is saying that both the analog and digital outputs are limited to
48KHz


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-02-12 Thread Wombat

lapis molari;268053 Wrote: 
> Since opening this thread, I have downsampled all 24/96 files to 24/48.
> It works perfectly! I recommend it to all SB users as the solution.
> This sounds much better than SB's interpretation of the 24/96. I went
> with Voxengo's r8brain pro and am a very happy listener. With most
> albums I actually can't hear a difference between the downsampled
> tracks and the original (played on an Oppo 980h). I tested a few down
> to 16/44.1 and that did bring a noticable loss.

Regarding r8brain as SRC to 16/44.1 there are better things. r8brain
doesn´t perform complex dither. You may try ssrc_hp with this frontend
for example: http://www.holliesoft.de/software/ssrcgui_english.htm
The proper ssrc compile is on http://www.rarewares.org/others.php
Try ATH based dither or with less amplitude with at least triangular
noise (1)
Hope it works better for you.


-- 
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Transporter -> Avantgarde based monoblocks -> self-made speakers

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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-02-12 Thread redil

lapis molari;268053 Wrote: 
> Since opening this thread, I have downsampled all 24/96 files to 24/48.
> It works perfectly! I recommend it to all SB users as the solution.
> This sounds much better than SB's interpretation of the 24/96. I went
> with Voxengo's r8brain pro and am a very happy listener. With most
> albums I actually can't hear a difference between the downsampled
> tracks and the original (played on an Oppo 980h). I tested a few down
> to 16/44.1 and that did bring a noticable loss.

Nowhere in this thread I read which out of the SB3 is used. I assume
that it is the analog. What happens if the SB3 is fed 24/96 and the
TOSLINK output is fed into an external AV (as I do). Is there also a
degradation? Sean will be able to answer this.

greetings

Redil


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-02-11 Thread lapis molari

Since opening this thread, I have downsampled all 24/96 files to 24/48.
It works perfectly! I recommend it to all SB users as the solution.
This sounds much better than SB's interpretation of the 24/96. I went
with Voxengo's r8brain pro and am a very happy listener. With most
albums I actually can't hear a difference between the downsampled
tracks and the original (played on an Oppo 980h). I tested a few down
to 16/44.1 and that did bring a noticable loss.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-02-10 Thread Pale Blue Ego

I would second the suggestion to create SB3-friendly 24/48 FLAC files
from the 24/96 WAVs.  Naturally, you would also keep the 24/96 files
for when you get a Transporter (or SB4!).

dbPowerAMP is what I use to convert the WAVs.  When encoding to FLAC I
would use the lowest compression setting, so the SB3's CPU has less
work to do in decoding.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2008-02-10 Thread Timothy Stockman

As a matter of fact I used the FLAC Frontend yesterday to encode the
24/192/2.0 from the Classic HDAD of Alan Parsons' "Eye in the Sky".  It
can't do the ReplayGain calculation above 48 KHz, so that option must be
unchecked, but it encoded fine.  Rather slowly, but fine.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-18 Thread Mark Lanctot

ezkcdude;249745 Wrote: 
> Going back to the thread title, how do people actually create "true"
> 24/96 FLAC? I've made some 24/96 WAV recordings (using a Zoom H4), but
> I haven't been able to figure out how to get 24/96 FLAC files from the
> source files. Any suggestions?

It's been a while since I played with 24/96, but I believe the standard
FLAC encoder or FLAC frontend will work just fine.

I have played with encoding 24/48 recently, FLAC gives a warning about
"legacy WAV file but bits per sample = 24" but encodes just fine.


-- 
Mark Lanctot

Sean Adams: "So you mean, aside from the fact that Squeezebox does not
do 96KHz, why doesn't it do 96KHz?"

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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-18 Thread bigfool1956

r8brain from voxengo is also a highly regarded sample rate and bit depth
converter for windows peeps.


-- 
bigfool1956

David Ayers
Music is what counts, hifi just helps us enjoy it more

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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-18 Thread adamslim

I found foobar to be better than DBPowerAmp for converting to 48kHz. 
Just downsample but keep the original files for when/if you get a
Transporter: HD space is free...

The FLAC frontend will convert 24/96 WAVs to FLAC IIRC - I think this
is what I used.  I just have so little hi-res source material as we
can't rip SACDs, bah humbug!


-- 
adamslim

Those are my principles, and if you don't like them... well, I have
others

'Last.fm group: people who don't listen to any of last.fm's top
artists'
(http://www.last.fm/group/People+who+don%27t+listen+to+any+of+last.fm%27s+top+artists)

SB+, EAR V20, Heybrook Sextets plus some other stuff
SB3, Shek d2, Ming-Da MC84-C, Harbeth HL-P3ES

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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-18 Thread amcluesent

>Not sure what's a good tool for that<

foobar2000 would be my choice for converting 24/96 WAV to FLAC, just
set the bit-depth on the FLAC plug-in.

foobar2000 with the Secret Rabbit DSP plug-in will also downsample
96khz FLAC to 48Khz while retaining 24bit depth.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-17 Thread seanadams

lapis molari;249746 Wrote: 
> I will save more, to afford my TP faster. Then I can listen to these
> files the way it should be done. :)

heh... that's the spirit. :)

In the mean time maybe consider batch-converting to 48 and keeping the
originals? Not sure what's a good tool for that.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-17 Thread lapis molari

I will save more, to afford my TP faster. Then I can listen to these
files the way it should be done. :)


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-17 Thread ezkcdude

Going back to the thread title, how do people actually create "true"
24/96 FLAC? I've made some 24/96 WAV recordings (using a Zoom H4), but
I haven't been able to figure out how to get 24/96 FLAC files from the
source files. Any suggestions?


-- 
ezkcdude

There are 10 kind of people in the world - those who understand binary
and those who don't.
SHINYMETAL
'*Site*' (http://www.ezdiyaudio.com)| '*RSS*'
(http://www2.kumc.edu/students/ezamir/rss/ezdiyaudio.xml) |'*Forum*'
(http://ezdiyaudio.informe.com)

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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-17 Thread seanadams

lapis molari;249727 Wrote: 
> Yep, within the parameter that the SB isn't fully capable of supporting
> this function, I want it to work as well as it can.

I realize that, but what I'm saying it's never going to work well with
the current mechanism. The only reasonable workaround would be to
detect 96KHz files on the server and apply proper SRC before streaming
to Squeezebox.

> I'm confused why high-res flac's show different problems.

Probably because FLAC's data rate will vary as a function of the type
of music, the noise level of the recording, and the encoder settings.
It will vary from one file to the next, and also from one instant to
the next within a single file.

> I also hope that other people will find it useful to read that certain
> 24/96 flacs play just fine on my SB. 

They might think it's useful, but it is untrue except for a very
bizarre definition of "just fine". Then they will repeat this incorrect
information whenever the subject arises, and they will call tech support
complaining about "problems" with 96KHz, they will think the product is
defective, etc. That is why this "feature" was a mistake!

What you are hearing is all of the content above 24KHz being aliased
all the way across the audible band. The reason you hear noise with
some files and not others is because some files may have nothing above
24KHz. But to say that it is playing just fine for those files is still
wildly inaccurate!

> Mr Adams, please don't remove this function. The 24/96 playback is one
> of the reasons I'm saving up for a TP, but I will sync that with my SB.
> I know several forum users have nagged you for the impossible. By all
> means, take the request on-board for an SB4. Other than that, don't
> give it too much thought.
> Again my thanks for your SB. You have changed the way I enjoy my music.
> I look forward to your next developments!

I do appreciate the kind words but I am still exhausted with this
issue. However, unfortunately I can not just ignore it because it is
causing a real problem.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-17 Thread lapis molari

Yep, within the parameter that the SB isn't fully capable of supporting
this function, I want it to work as well as it can.

The SB's hardware limitations are not confusing at all, I'm confused
why high-res flac's show different problems.
My reason for posting, is that I found a solution to Elvis' stutter
(see previous post) and I wonder if anyone else has found small
solutions to make playback better. I also hope that other people will
find it useful to read that certain 24/96 flacs play just fine on my
SB. If it's useful for anyone that I do any specific tests or provide
more details of my setup, just ask.

Mr Adams, please don't remove this function. The 24/96 playback is one
of the reasons I'm saving up for a TP, but I will sync that with my
SB.
I know several forum users have nagged you for the impossible. By all
means, take the request on-board for an SB4. Other than that, don't
give it too much thought.
Again my thanks for your SB. You have changed the way I enjoy my music.
I look forward to your next developments!


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lapis molari

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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-17 Thread seanadams

48 is the max, and the dac and s/pdif are driven together.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-17 Thread Jitterbug

seanadams;249706 Wrote: 
> So you mean, aside from the fact that Squeezebox does not do 96KHz, why
> doesn't it do 96KHz?  :)
> 
> 1) the audio outputs will not run faster than 48KHz
> 
Does this include digital out?

> 
> 2) the cpu is not fast enough to decode FLAC at 96KHz
> 
What about if decoding was done on the server?


I'm wondering if 96MHz is possible if the SB is used just for SPDIF
output


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-17 Thread seanadams

BTW it might be worth investigating on-the-fly decoding, decimation to
48, and re-encoding to FLAC on the server for 96KHz content (would
require flac of course, plus something like sox).

If someone could provide a patch to do that it would be a much better
solution.


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Re: [SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-17 Thread seanadams

So you mean, aside from the fact that Squeezebox does not do 96KHz, why
doesn't it do 96KHz?  :)

1) the audio outputs will not run faster than 48KHz
2) the cpu is not fast enough to decode FLAC at 96KHz
3) we try to play anyway, and drop every other sample to make it seem
like it's working. This WILL sound bad because it is not a proper
decimation algorithm, and since there is not enough CPU to even decode
at 96KHz, there is certainly not enough to decode 96Khz _and_ decimate
to 48KHz.

I regret that we made it pretend to play 96KHz. The rationale was that
it would be better than playing nothing in the case where a Squeezebox
is synched with a Transporter. Unfortunately, it has just resulted in
ongoing (sigh) complaints that it doesn't "work right". 

I don't really want to remove this non-feature because I'm sure whoever
asked for it is happy to have it, but if it continues to cause this
level of customer confusion then it will have to go.


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[SlimDevices: Audiophiles] Not all 24/96 flac's are created equal

2007-12-17 Thread lapis molari

I've read many posts covering the 24/96-flac problems for the SB3, but I
have not found any that address the different symptoms of these files.

- Classic Records DAD (extracted from dvd-v), several discs: play
without problem,
- Linn Records, Brahms violin crt & dances: has a much higher noise
floor than normal files,
- HDTT, Stravinksy's Firebird suite: no problem,
- Chesky, Jon Faddis' Remembrances: no problem,
- Elvis Presley, 30 #1 Hits (extracted the 2ch layer): SB doesn't keep
up with datastream (flac lvl8: audiostream starts stuttering after
15-20 seconds, lvl5: after 1 -1 1/2 min, lvl3: slowdown is hardly
audible, lvl1: I don't hear any delays).

The Linn and HDTT were purchased in flac, the others I converted with
flac 1.2 lvl5.
When burned to a dvd-audio, the Linn noisefloor is not present. 
Converting the Linn flacs to wav and back to (lower compression lvl)
flac does not make a difference.
Stuttering Elvis also plays fine in wav, but that loses the tags.
Everything is played from a wired Linkstation Live through a wired
SB3.

I appreciate Sean Adams' point that the SB was never designed for
24/96, but that doesn't mean we shouldn't see if we can minimise the
shortcomings for this. Has anyone done rigorous research as to the
cause of these problems? Is there a best version of flac to use for
this? Optimal compression lvl? Faster NAS?

I know the other two options: convert all my 96kHz to 48 kHz, or buy a
Transporter. I'm saving up for the TP, but that's all the more reason
not to want to downsample the  music.

P.S. Mr Adams, my compliments to a superb product-bundle (SB and ss)
and the droolalicious bigger cousin (TP).


-- 
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