Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Burning CD-Rs at 1x Speed
#379026 - 10/11/06 03:01 PM
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Yesterday I burnt two tracks at 1speed on my cdr and I can't tell you how astonished I was
by the results.
The highs were so crisp they were edible.
I don't know what
other speeds or cheaper media do to the sound,but they sound so cheap and filtered
compared to what I heard.
Is there a point?
Well any stage of
audio process can alter your sound I suppose,but this final stage has got me
excited,again.
Edited title to make it more meaningful and to stop the
pointless bickering! HR
Edited by Hugh Robjohns (14/11/06 10:29 AM)
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jellyjim
active member
Joined: 15/05/02
Posts: 2957
Loc: uk
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I'm getting great results hard disk recording to a vintage 2Gb Maxtor drive. Far superior
dynamic response than modern drives; rich mids, sparkly highs, rounded lows etc. Something
to do with the resonant frequencies of the bearings used in older drives and their effect
on how data is laid down on the magnetic surface and also error correction on playback.
-------------------- Original artwork and unique devices inspired by vintage technology http://www.thisisobsolete.com
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Tímo
Joined: 25/09/02
Posts: 1823
Loc: Derby, England
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Re: 1x
[Re: jellyjim]
#379037 - 10/11/06 03:20 PM
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Lol. Is this a wind up? April was months ago..
-------------------- http://Infekted.org ~ Access Virus news & community
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ibliss
member
Joined: 02/10/00
Posts: 325
Loc: UK
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Re: 1x
[Re: Tímo]
#379101 - 10/11/06 05:08 PM
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Don't know about wind up, but it's a really crap thread title. I VERY rarely bother to
look at posts that don't have a title that indicates what might be inside. People should realise that the extra 15 seconds it takes to put a proper meaniful title
on a thread is very well spent. eg "1x" should have been "1x burning sounds
better" or "big problem" becomes "problem with eq'ing bass" well, that's another minute of my life wasted.
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Re: 1x
[Re: Tímo]
#379122 - 10/11/06 06:14 PM
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Quote Tímo:
Lol. Is this a wind
up? April was months ago..
No! why?
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Re: 1x
[Re: ibliss]
#379123 - 10/11/06 06:17 PM
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Quote ibliss:
Don't know about
wind up, but it's a really crap thread title. I VERY rarely bother to look at posts that
don't have a title that indicates what might be inside.
People should realise
that the extra 15 seconds it takes to put a proper meaniful title on a thread is very well
spent.
eg "1x" should have been "1x burning sounds better"
or
"big problem" becomes "problem with eq'ing bass"
well, that's another
minute of my life wasted.
Sounds like anal retention to me 
If you know about cd burning then you would realise what it is straight away.
Thanks for pointing out your ignorance.
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Mowens800
Joined: 16/06/05
Posts: 918
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I figured 1x would be about burning speeds. I agree though that people
shouldn't post "big problem" as a thread title, those ones are stupid. People do it hoping
curiosity will result in more people checking it out. You burned the tracks at
1x, but did you actually compare them to the same material burned at a faster speed? or
just what you can remember previously hearing, because if not, that wouldn't be a fair
test, also your hearing cannot decided which is better that way, it needs instant A/B
comparisons far as I understand, which might not be very far  Burning slower is better though, reduces error. I think Bob Katz recommends 2x or 4x, no
faster, but that will change as drives get faster and more accurate. (at a guess)
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James Perrett
Joined: 10/09/01
Posts: 9660
Loc: The wilds of Hampshire
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If burning at 1X sounds different to burning at other speeds then there is something wrong
with your setup and you need to ask yourself why is this happening? Are there errors on
the disc? Is there something else about the disc that is different? Is your CD player
working properly? I don't doubt that you are hearing something but the
differences are down to the problems with your gear and would not be apparent in a
properly setup system. The big problem is that properly set up systems are rarer than you
might think. Cheers James.
-------------------- JRP Music - Audio Mastering and Restoration.
http://www.jrpmusic.net
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TAKEN.BALL.GONE.HOME
posting's fun
Joined: 16/09/02
Posts: 1638
Loc: Manchester, UK and Den Haag, N...
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Quote Music Manic:
Sounds like
anal retention to me 
If you know about cd burning then you would realise what it is straight away.
Thanks for pointing out your ignorance.
MM, this is hardly being anal as you put it. It's just basic forum
etiquette.
For the record, if I see 1x I assume it's about 802.1x - which this
isn't.
-------------------- TAKEN.BALL.GONE.HOME
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Re: 1x
[Re: Mowens800]
#379246 - 11/11/06 03:27 AM
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Quote Mowens800:
I figured 1x
would be about burning speeds.
I agree though that people shouldn't post "big
problem" as a thread title, those ones are stupid. People do it hoping curiosity will
result in more people checking it out.
You burned the tracks at 1x, but did you
actually compare them to the same material burned at a faster speed? or just what you can
remember previously hearing, because if not, that wouldn't be a fair test, also your
hearing cannot decided which is better that way, it needs instant A/B comparisons far as I
understand, which might not be very far 
Burning slower is better though, reduces error. I think Bob Katz recommends 2x or 4x, no
faster, but that will change as drives get faster and more accurate. (at a guess)
I've not needed to give them a
direct A/B comparison because the difference was that great.I've been burning the disks at
faster speeds to give out but had to burn some better quality presentations(graphic wise
too)and realised the difference immediately.
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Quote James Perrett:
If burning
at 1X sounds different to burning at other speeds then there is something wrong with your
setup and you need to ask yourself why is this happening? Are there errors on the disc? Is
there something else about the disc that is different? Is your CD player working
properly?
I don't doubt that you are hearing something but the differences are
down to the problems with your gear and would not be apparent in a properly setup system.
The big problem is that properly set up systems are rarer than you might think.
Cheers
James.
If what you say is true James,why have Plextor bought CAV technolgy from Yamaha?
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Quote JimiQ:
Quote Music Manic:
Sounds like
anal retention to me 
If you know about cd burning then you would realise what it is straight away.
Thanks for pointing out your ignorance.
MM, this is hardly being anal as you put it. It's just basic forum
etiquette.
For the record, if I see 1x I assume it's about 802.1x - which this
isn't.
Ok I get your
point but if we're on the point of etiquette wouldn't it be more polite to say that my
heading was quite vague,rather than "crap".
We all have different ways of
expressing ourselves and there's a certain tolerance level that should be given within
democratic environments.
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narcoman
active member
Joined: 14/08/01
Posts: 8469
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i knew what you meant dude !!
I gotta agree with above, if 1x sounds better
then there is something wrong. Burning at 1x speed should generate more erros than any
otherspeed simply because you can easily attain a buffer underrun. 1x has always been seen
as the speed to avoid, i seem to remember lots of articles many years ago on this exact
topic ! This is NOT the same, however, as using a standalone buffered writer with audio
ins. Im assuming your referring to PC/MAC writers.
HOWEVER - it should be
pointed out - with a modern pc getting a buffer underrun is a less and less likely event -
BUT, still best avoided. Manufacturers often recommend a speed plop in the middle of the
rating of the burner.
-------------------- Battenburg to the power of 20 - said by Richie Royale in a moment of genius. 4pm. Wed 16th Nov 2011. Remember where you were....
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thejazzassassin
Joined: 11/04/06
Posts: 429
Loc: Billingbear
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Point is, ibliss, is that you came to see this thread. The title worked.
Interesting titles, more often than not, make people look at your thread. Some people
need to lighten up around here. And not be so rude. It's a forum of music makers, not
pedants.
just my opinion.
-------------------- www.mikeandersonmusic.co.uk
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Hugh Robjohns
SOS Technical Editor
Joined: 25/07/03
Posts: 18390
Loc: Worcestershire
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The issue that seems to catch most people out is using a CD-R designed for one range of
burning speeds on a burner designed (or configured) for another.
Burning discs
intended for 12x and higher at 1x will produce unreliable results in the same way as using
1x discs at 24x burn speed.
The Plextor drives often come with analysis
software that allwos you to check the block error rates of burned discs, and if you make
some trial burns you'll quickly find the combination of disc type and burn speed that
provides the lowest error rate.
hugh
-------------------- Technical Editor, Sound On Sound
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Ian Stewart
Joined: 24/10/05
Posts: 3638
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Quote Hugh Robjohns:
The
Plextor drives often come with analysis software that allwos you to check the block error
rates of burned discs, and if you make some trial burns you'll quickly find the
combination of disc type and burn speed that provides the lowest error rate.
Is there any software that
enables checking the error rate of CDRs burnt on a mac's internal cd burner that you know
of?
-------------------- No longer a forum member.
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Thanks guys.I've had a hard week and thouhgt it may have been me. I've got the
external and EIDE version of Yamaha
CRW-F1 It claims it was built for audio,that's why I am questioning the
setup you are talking about.Further to that if all cd burners are equal,why are there
different version? Hugh! You didn't get angry! Are you ok?
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Doublehelix
Joined: 04/12/02
Posts: 4162
Loc: USA
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Personally, I don't care for the thread title either, but I am not going to make an issue
of it. The title of a thread should convey what is being discussed in the thread, and "1X"
is a bit vague. If the poster thinks that his choice of titles is what is going to attract
the most interest, then who am I to argue? I personally feel that I get the most interest
when I am pretty clear in the topic.
I find that 8X seems to be about right
for most of what I do with the Taiyo Yuden CDs that I buy for use with my Plextor drive. I
find that if I burn any faster (16X, 24X, etc.), I don't really notice much of a quality
degradation, but I do notice that sometimes the CD will start skipping within a month or
two or three...
-------------------- James
"Never interrupt your enemy when he is making a mistake" ~Napoleon Bonaparte~
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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I did get the point about the title of the thread.Forgive me for I have sinned.It won't
happen again.Everyone happy?
It's the only forum I come to apart from my
soundcard's one so I have time to read everything,but I understand that you guys are
trying to create a standard.
I will do a hundred lines after work tonight(and
don't even think it).
Thank you
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James Perrett
Joined: 10/09/01
Posts: 9660
Loc: The wilds of Hampshire
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Quote noiseconjecture:
Is there any software that enables checking the error rate of CDRs burnt on a mac's
internal cd burner that you know of?
You'll have to install a Plextor drive and run Plextools under Virtual PC - this
very question has been discussed a number of times on various mastering forums and no-one
has come up with any other alternative.
Cheers
James.
-------------------- JRP Music - Audio Mastering and Restoration.
http://www.jrpmusic.net
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James Perrett
Joined: 10/09/01
Posts: 9660
Loc: The wilds of Hampshire
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Quote Music Manic:
I've got the external and EIDE version of Yamaha
CRW-F1
It claims it was built for audio,that's why I am questioning the
setup you are talking about.Further to that if all cd burners are equal,why are there
different version?
The
first thing that you need to check is whether your 1X and higher speed discs are data
identical. Have you tried extracting the audio from them and digitally comparing this with
the source? If there are differences then you have a problem with the burner or the discs
themselves. If there are no differences then we have to start to look at what you are
playing them on. Are you using an integrated CD player or are you using a separate DAC?
How sensitive to jitter is the DAC.
You have a decent drive but drives have a
finite lifetime and, if it has been well used, there is a possibility that it is starting
to fail. There is really no substitute for running a proper set of diagnostic tests to
find the source of the differences you hear.
Cheers
James.
-------------------- JRP Music - Audio Mastering and Restoration.
http://www.jrpmusic.net
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ibliss
member
Joined: 02/10/00
Posts: 325
Loc: UK
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"Point is, ibliss, is that you came to see this thread. The title worked."Well, no. I opened it thinking "of all the lazy titles I've seen..." and then proceeded
to vent, and in doing so did something evil myself by posting totally off topic and not
relevent to the thread (well, it was in a way, but not that helpful - should have vented
in Community). Sorry about that MM and others. Anyway  I'd second James' idea - try ripping the CD back into your computer and doing some kind
of comparison of the source and copy. I wonder if you put the two into a multitrack and
reversed the phase of one what you might be left with? If you did the same with a disc
burnt at a higher speed, is there more or less difference between the copy and source?
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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I'm no expert but can the 0's and 1's be identical on both discs and different when played
on each cd.
One thing the yamaha drive does is write the data over a longer
distance as you would have on an analogue tape.30ips would be better than 15ips right?
Then we would come down to dye on cd,laser of player etc.
Will test on same
player tomorrow.
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IvanSC
Joined: 08/03/05
Posts: 7760
Loc: UK France & USA depending on t...
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Re: 1x
[Re: Mowens800]
#379508 - 12/11/06 06:40 AM
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Quote Mowens800:
I figured 1x
would be about burning speeds.
I agree though that people shouldn't post "big
problem" as a thread title, those ones are stupid. People do it hoping curiosity will
result in more people checking it out.
You burned the tracks at 1x, but did you
actually compare them to the same material burned at a faster speed? or just what you can
remember previously hearing, because if not, that wouldn't be a fair test, also your
hearing cannot decided which is better that way, it needs instant A/B comparisons far as I
understand, which might not be very far 
Burning slower is better though, reduces error. I think Bob Katz recommends 2x or 4x, no
faster, but that will change as drives get faster and more accurate. (at a guess)
Pillock! I for one had no idea
what thew thread was about either. I think you are mistaking us with the OTHER SOS forum,
where all the members have paranormal powers. I myself was banned as apparently MY
paranormal powers are an an ability to cause spontsaneous combustion of forum threads.
Dunno WHERE I got that from....
But I have to say I too have experienced the 1x
burning syndrome on an elderly Yamaha burner. only trouble is, it doesn`t like 80 track
media.
-------------------- Me? But I`m such a loveable old bugger!
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James Perrett
Joined: 10/09/01
Posts: 9660
Loc: The wilds of Hampshire
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Quote Music Manic:
I'm no expert
but can the 0's and 1's be identical on both discs and different when played on each
cd.
One thing the yamaha drive does is write the data over a longer distance as
you would have on an analogue tape.30ips would be better than 15ips right? Then we would
come down to dye on cd,laser of player etc.
Will test on same player tomorrow.
It is certainly possible for
different CD's carrying the same data to sound different on certain CD players. This says
more about the quality of the CD player than the discs though - as a decent CD player will
always play the same data in the same way.
The Yamaha drive is actually
stretching the CD pit lengths closer to the limits of the Red Book tolerances in order to
obtain a disc with a shorter playing time so could actually be causing greater problems
with certain CD players. I'm not convinced that this isn't just a gimmick. However,
audiophiles seem to like this kind of gimmick which is why it has appeared on other drives
now.
Cheers
James.
-------------------- JRP Music - Audio Mastering and Restoration.
http://www.jrpmusic.net
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narcoman
active member
Joined: 14/08/01
Posts: 8469
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can i just mildly defend the original poster by asking why some people had a little
ribbing at the "1x" title, and yet no-one complains at the , at least weekly", "your
advice on this" or "i have a question" or this weeks "your two cents about this one"
....
-------------------- Battenburg to the power of 20 - said by Richie Royale in a moment of genius. 4pm. Wed 16th Nov 2011. Remember where you were....
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IvanSC
Joined: 08/03/05
Posts: 7760
Loc: UK France & USA depending on t...
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Re: 1x
[Re: narcoman]
#379942 - 13/11/06 11:43 AM
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Quote narcoman:
can i just mildly
defend the original poster by asking why some people had a little ribbing at the "1x"
title, and yet no-one complains at the , at least weekly", "your advice on this" or "i
have a question" or this weeks "your two cents about this one" ....
For my part I would have let it lie
but for the initial comment and the poster`s reaction to it.
Mostly people who
put up idiotic subject lines get what they deserve, myself included. Come to think of
it there is prolly more on this thread about the subject line than his original post,,,,,
-------------------- Me? But I`m such a loveable old bugger!
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Re: 1x
[Re: narcoman]
#380020 - 13/11/06 01:18 PM
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Quote narcoman:
can i just mildly
defend the original poster by asking why some people had a little ribbing at the "1x"
title, and yet no-one complains at the , at least weekly", "your advice on this" or "i
have a question" or this weeks "your two cents about this one" ....
A friend at last.
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Re: 1x
[Re: IvanSC]
#380030 - 13/11/06 01:31 PM
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Quote IvanSC:
Quote narcoman:
can i just
mildly defend the original poster by asking why some people had a little ribbing at the
"1x" title, and yet no-one complains at the , at least weekly", "your advice on this" or
"i have a question" or this weeks "your two cents about this one" ....
For my part I would have let it lie
but for the initial comment and the poster`s reaction to it.
Mostly people who
put up idiotic subject lines get what they deserve, myself included. Come to think of
it there is prolly more on this thread about the subject line than his original post,,,,,
You sound hurt for no
reason,seeing my reaction had nothing to do with you.
I have the right to
defend myself if I am insulted,and come to think of it If one doesn't like what's in the
window,one doesn't have to walk in the shop.Simple as that. What type of reaction
does a person feel when he is insulted by a grown man,without constructive criticism? I would've expected that at school not here.
If you are one of those people
who think everybody should behave and react in a certain manner why do you come to such
forums? These places are for people who don't understand and need help in certain things
musical.Nothing to do with English grammar.Further to that,this is a Democracy not a
Dictatorship?
"I got what I deserved" 
How childish!!!
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Guy Johnson
Joined: 02/05/03
Posts: 3955
Loc: Pembrokeshire
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A nice, concise and obvious title. This is a music production forum! Come on!
I tend to burn at 8 or 16 times, using TaioYuden discs. All fine. As pointed out, you ought to match media with speed, and I like to leave a margin when
burning, so I never burn at maximum speed. G
-------------------- PA stuff on FB
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Yes always use TaioYuden Guy for important jobs and they've never failed me yet. Going to test more over week.
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ibliss
member
Joined: 02/10/00
Posts: 325
Loc: UK
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MM:"...What type of reaction does a person feel when he is insulted by a grown
man,without constructive criticism? ."
I didn't insult you, and the
critisism (of poor thread titling) was constructive.
You then called me
stupid for not being 'getting' the blindingly obvious "1x" thread title.
I
later posted again to apologise for posting Off Topic, which you do not seem to have taken
into account.
MM"These places are for people who don't understand and need
help in certain things musical."
Which was kind of my point really - they
don't come here to wade through a series of cryptic thread titles in the hope that they
might read something useful.
-nuff said, as they say.-
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MadManDan
Joined: 13/09/04
Posts: 1853
Loc: Across the pond....New Yawk
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If y'all had such a problem with the name of this thread why didn't you just change it??
[Re: Music Manic]
#380245 - 13/11/06 10:25 PM
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Quote Music Manic:
I did get the
point about the title of the thread.Forgive me for I have sinned.It won't happen
again.Everyone happy?....I will do a hundred lines after work tonight(and don't even think
it).
Thank you
          These
folks were rough on you! I agree, the title of the thread could've been a wee bit more
descriptive, but g-d,,,, they ripped you a new one. Glad you took it in stride, because
this really is a great forum. DAn
-------------------- Gear list: If you can't find it, grind it
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Re: 1x
[Re: ibliss]
#380322 - 14/11/06 02:02 AM
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Quote ibliss:
MM:"...What type
of reaction does a person feel when he is insulted by a grown man,without constructive
criticism? ."
I didn't insult you, and the critisism (of poor thread
titling) was constructive.
You then called me stupid for not being
'getting' the blindingly obvious "1x" thread title.
I later posted again to
apologise for posting Off Topic, which you do not seem to have taken into account.
MM"These places are for people who don't understand and need help in certain
things musical."
Which was kind of my point really - they don't come here
to wade through a series of cryptic thread titles in the hope that they might read
something useful.
-nuff said, as they say.-
Don't worry ibliss I still have love for you
as a fellow human being.We're quits,and I do respect any comments but do like to answer
back
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Re: If y'all had such a problem with the name of this thread why didn't you just change it??
[Re: MadManDan]
#380323 - 14/11/06 02:04 AM
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Quote MadManDan:
Quote Music Manic:
I did get
the point about the title of the thread.Forgive me for I have sinned.It won't happen
again.Everyone happy?....I will do a hundred lines after work tonight(and don't even think
it).
Thank you
          These
folks were rough on you! I agree, the title of the thread could've been a wee bit more
descriptive, but g-d,,,, they ripped you a new one. Glad you took it in stride, because
this really is a great forum. DAn
I can take it because "I'm a macho macho maa-aan!"
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IvanSC
Joined: 08/03/05
Posts: 7760
Loc: UK France & USA depending on t...
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Damn! Just when this was getting to be fun, you all went touchy-feely on me!
P.S. anyone who uses y`all HAS to be from the South, so I guess I have to forgive
you.
OOTP: One thing I have noticed is that I get MUCH more reliable burns on
my elderly Yamaha nopn-80 min drive for audio than anything else I own, regardless of
speed. `course it IS a bummer when you forget and try to read a "big" cd in it.....
-------------------- Me? But I`m such a loveable old bugger!
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--
active member
Joined: 29/05/03
Posts: 6085
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Is it too late to say that I immediately understood the thread subject from the title
(even tough the title has now been changed)?
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Hugh Robjohns
SOS Technical Editor
Joined: 25/07/03
Posts: 18390
Loc: Worcestershire
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Re:1x
[Re: --]
#380495 - 14/11/06 01:51 PM
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Yes, much too late.  I changed
the title to try to isolate that rather pointless aspect of the discussion from the more
relevant and interesting one. hugh
-------------------- Technical Editor, Sound On Sound
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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I really don't like the title thread of this post.
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artbreak
Joined: 18/11/05
Posts: 226
Loc: Austria
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Re: Burning CD-Rs at 1x Speed
[Re: Music Manic]
#380654 - 14/11/06 06:03 PM
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in trying to get this thread back on an interesting track (hugh) I always burn at
maximum double speed if its for a pressing plant... I figure if i have spent weeks on a
project whats the point in hurrying the last hour and burning at a speed close to light ?
I use the time burning to write or print the details for the plant on the box etc: also i do not trust tolerances with the CD holes as burning faster can cause the CD to
wobble and vibrate which cant to the error count any good::::: hope that opens a new
can of worms
-------------------- I could´nt sleep till I put it down
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James Perrett
Joined: 10/09/01
Posts: 9660
Loc: The wilds of Hampshire
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Re: Burning CD-Rs at 1x Speed
[Re: artbreak]
#380800 - 14/11/06 11:00 PM
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Quote artbreak:
I always
burn at maximum double speed if its for a pressing plant...
How do you know that this is giving you best
results? Do you test the master CD's that you send to the pressing plant?
Cheers
James.
-------------------- JRP Music - Audio Mastering and Restoration.
http://www.jrpmusic.net
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artbreak
Joined: 18/11/05
Posts: 226
Loc: Austria
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Re: Burning CD-Rs at 1x Speed
[Re: Music Manic]
#380886 - 15/11/06 07:39 AM
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well james I havent the error checking machines  (nice tho
aren't they),I do carry out a null test with the resulting Pre-Productions Master and my
pressing plant of chioce is Sony in Anif/Salzburg.Until this time i have had none
rejected. If i have a spare few hours I will burn at different speeds tho I dont
think I will hear much sonic difference from this. (will certainly test this theory
tho ...anyone else done this?) I also perform a null test with the end product
as one is never sure whose bored little hands your project falls into and that he /she
decides your music is not bassy enough
-------------------- I could´nt sleep till I put it down
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James Perrett
Joined: 10/09/01
Posts: 9660
Loc: The wilds of Hampshire
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Re: Burning CD-Rs at 1x Speed
[Re: artbreak]
#380931 - 15/11/06 10:20 AM
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Sounds like you are taking a sensible approach although a Plextor drive with Plextools
isn't that expensive if you want a more quantifiable test. I'm just trying to dispel all
the myths and rumours around CD burning. On some CD players you will certainly hear
differences between discs burned at different speeds - but all that tells you is that it
is time to throw out that CD player and buy something that works properly. If
you want to improve the sound of the CD's pressed from your masters then you have to talk
to the pressing plant and see if they will run their glass mastering process at a lower
speed for you. The quality of the glass master bears no relation to the quality of the CD
master you send the plant (despite what many people believe) and there are various tweaks
that certain plants have carried out to improve the sound of CD's when played in jitter
sensitive CD players. At one point JVC had a 1X low jitter LBR while I know that DCA, who
make the glass mastering systems that many plants use, have taken steps to improve the
jitter performance of their systems. Cheers James.
-------------------- JRP Music - Audio Mastering and Restoration.
http://www.jrpmusic.net
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Jeraldo
Joined: 10/09/05
Posts: 2132
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Re: Burning CD-Rs at 1x Speed
[Re: James Perrett]
#382265 - 17/11/06 11:07 PM
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This seems relevant to some of this discussion. I find it interesting, but I'm not
endorsing (or not) any of the ideas. http://www.rogernichols.com/EQ/EQ_2000_02.html
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Music Manic
active member
Joined: 20/12/02
Posts: 1890
Loc: London UK
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Re: Burning CD-Rs at 1x Speed
[Re: Jeraldo]
#382313 - 18/11/06 03:27 AM
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Quote Jeraldo:
This seems
relevant to some of this discussion. I find it interesting, but I'm not endorsing (or not)
any of the ideas.
http://www.rogernichols.com/EQ/EQ_2000_02.html
The point I keep expressing about the 0s and
1s being the same on all cds is pointed out here.The laser may express them differently
thus giving a different analogue waveform to the ear. Press mastering is different to
burning though isn't it because everyone is the same as opposed to the different dyes etc
of a blank cd-r. Yes the clock of the D/A is also going to contribute to the audio
signal.
So what is proved? If the Jitter is perfect,will all cds sound the
same? If the cds are physically the same jitter problems will definitely change the
sound each time. If error correction contributes to adding missed 0s and 1s will it
re-represent the exact waveform?
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Jeraldo
Joined: 10/09/05
Posts: 2132
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Re: Burning CD-Rs at 1x Speed
[Re: Music Manic]
#382314 - 18/11/06 03:38 AM
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Quote Music Manic:
Press
mastering is different to burning though isn't it because everyone is the same as opposed
to the different dyes etc of a blank cd-r.
Yes, it's a totally different process, but the issues would
seem to be the same. I think...
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Hugh Robjohns
SOS Technical Editor
Joined: 25/07/03
Posts: 18390
Loc: Worcestershire
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Re: Burning CD-Rs at 1x Speed
[Re: Music Manic]
#382429 - 18/11/06 03:48 PM
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Quote Music Manic:
The point I
keep expressing about the 0s and 1s being the same on all cds is pointed out here.
...but it's not true. A CD is an
analogue recording medium, just like everything else. In the cases of both pressed and
burned CDs the designers chose to represent the data by using the pit length -- but normal
pressing/burning variations mean that pit lengths vary slightly.
This results
in a form of jitter that needs to be removed before the data can be extracted reliably.
Not all CD player systems are equal in this regard.
In extreme cases, the error
correction system has to work a lot harder to recover the data. This combined with the
jitter effects can have audible effects on other parts of the CD players circuitry -- most
usually the power supply systems. Varying PSU levels will affect analogue circuitry in
quite subtle but audible ways.
Quote:
Press mastering is different to burning though isn't it because
everyone is the same as opposed to the different dyes etc of a blank cd-r.
Not really. Pressed discs are stamped out
and that stamper wears out relatively quickly. So the first discs produced will have much
more sharply defined pits than the last discs it produces. Hence, varying levels of data
jitter again, and possibly significantly lower definition of the reflected laser light to
signify the difference between the presence of absence of a pit -- meaning a noiseier
signal to start recovering data from.
Quote:
If the Jitter is perfect,will all cds sound the same?
It never can be. The medium and the
production professes are imperfect. As they are in all recording formats.
Quote:
If error correction
contributes to adding missed 0s and 1s will it re-represent the exact waveform?
It will if it is working correctly.
Error correction does what it says on the tin. It corrects the data, and there fore the
output will be correct.
The problem is that the error correction employed in
audio CDs is relatively weak and feeble, and was actually optimised to fight a specific
disc problem that was quickly eliminated by the factories when CDs started to be mass
produced.
So when the going gets tough the error correction system actually
gives up and relieds on 'interpolation' during which it guesses tat the best fit sample
value given what came before and after the bad bit. Clearly, that won't be exactly the
same as the original...
Hugh
-------------------- Technical Editor, Sound On Sound
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Jeraldo
Joined: 10/09/05
Posts: 2132
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Thread rating depressed
[Re: Music Manic]
#382443 - 18/11/06 04:17 PM
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After I voted for max rating of thread, the forum said I voted a 1, so a star disappeared.
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James Perrett
Joined: 10/09/01
Posts: 9660
Loc: The wilds of Hampshire
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Re: Burning CD-Rs at 1x Speed
[Re: Hugh Robjohns]
#382481 - 18/11/06 05:30 PM
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Quote Hugh Robjohns:
So
when the going gets tough the error correction system actually gives up and relieds on
'interpolation' during which it guesses tat the best fit sample value given what came
before and after the bad bit. Clearly, that won't be exactly the same as the
original...
Hugh
Uncorrectable errors on well looked after CD's are very rare - I only see them on CD's
that have been obviously scratched. Even second level correctable errors are rare on most
clean CD's that I've checked. The audio CD error correction system is possibly better than
Hugh implies, although it is certainly inferior to that used for data CD's.
Cheers
James.
-------------------- JRP Music - Audio Mastering and Restoration.
http://www.jrpmusic.net
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