[Review] CD lathe update
- Thread starter larkrise
- Start date
Bob Patefield
The Future is Digital
Hi there.
Just for info, the black pen is only intended to seal the edge of the disc and prevent any oxidation of the aluminum layer. So long as the marker is solvent based it will do the job. I will try the green pen though.
Also, I have just been informed that the CD Sound Improver has just won a 'Product of the Year' from Hi-fi +.
Regards
Bob
Lyngdorf Audio UK
Distributor of the CD Sound Improver
Just for info, the black pen is only intended to seal the edge of the disc and prevent any oxidation of the aluminum layer. So long as the marker is solvent based it will do the job. I will try the green pen though.
Also, I have just been informed that the CD Sound Improver has just won a 'Product of the Year' from Hi-fi +.
Regards
Bob
Lyngdorf Audio UK
Distributor of the CD Sound Improver
I must bow to your info ....
but that was not what has been posted on the web .
there is a technical drawing I've seen that shows the ray path and how the angles reflect the ray into the 38degree[?] angle, the black ink then absorbs the remainer. This also shows an ink layer both top and bottom. I may of course have read too much into it but the black and green inks seem to have a different "flavour" on duplicate disc treated identically.
but that was not what has been posted on the web .
there is a technical drawing I've seen that shows the ray path and how the angles reflect the ray into the 38degree[?] angle, the black ink then absorbs the remainer. This also shows an ink layer both top and bottom. I may of course have read too much into it but the black and green inks seem to have a different "flavour" on duplicate disc treated identically.
Bob Patefield
The Future is Digital
Hi Zanash.
You are right.
I was rushing when I posted and shouldn't have said 'the black pen is only intended'.
I think it was Reiner Glass who told me it sealed the edge of the disc. Obviously this is an important step.
I must also point out that it's not advisable to use the CD Sound Improver on dual layer SACD's. They tend to split. Single layer SACDs are fine.
Reiner has been informed of this and a warning should be in with all new units.
Some info from his website below.
I will still try the green pen though.
Regards
Bob
Does green or black work?
A hot tip in audio expert circles is the colouring of the CD's edge with a felt pen, to absorb the light scatter. The effect unfortunately doesn't deliver on its promise. Green as a complimentary colour to the red laser should bring better results, this is however often not the case as many lasers work with the infra-red spectrum.
Simple and effective: the 36° bevel
Turning round and absorption
In exhaustive tests biochemist Dr. Erich Schrott and engineer Wolfgang Schneider have looked for ways to eliminate the disruptive reflections. They found an amazingly simple, yet highly effective, tuning method. The CD's outer edge is bevelled and works as a trap for the light scatter. Black colouring absorbs additional misrouted laser light. An edge angle of 36° brings audibly the best results.
You are right.
I was rushing when I posted and shouldn't have said 'the black pen is only intended'.
I think it was Reiner Glass who told me it sealed the edge of the disc. Obviously this is an important step.
I must also point out that it's not advisable to use the CD Sound Improver on dual layer SACD's. They tend to split. Single layer SACDs are fine.
Reiner has been informed of this and a warning should be in with all new units.
Some info from his website below.
I will still try the green pen though.
Regards
Bob
Does green or black work?
A hot tip in audio expert circles is the colouring of the CD's edge with a felt pen, to absorb the light scatter. The effect unfortunately doesn't deliver on its promise. Green as a complimentary colour to the red laser should bring better results, this is however often not the case as many lasers work with the infra-red spectrum.
Simple and effective: the 36° bevel
Turning round and absorption
In exhaustive tests biochemist Dr. Erich Schrott and engineer Wolfgang Schneider have looked for ways to eliminate the disruptive reflections. They found an amazingly simple, yet highly effective, tuning method. The CD's outer edge is bevelled and works as a trap for the light scatter. Black colouring absorbs additional misrouted laser light. An edge angle of 36° brings audibly the best results.
tones
compulsive cantater
If aluminium is exposed at all to air, it's too late to prevent oxidation. Metallic aluminium exposed to air oxidises at incredible speed, far faster than you can put on a coat of anything. If this device exposes the aluminium layer, I personally wouldn't use it.Bob Patefield said:
tones
compulsive cantater
9designs said:The conclusion I just came to once reading the disc is opened up
I have a disc, not modded in anyway, and it has corroded in from the edge.... must have been bad manufacturing....
Sounds like a failure of the acrylic top coat. After the aluminium is applied (in vapour form under conditions of high vacuum), the acrylic is applied and the discs spun so that the centrifugal force spreads it evenly over the whole surface. (One of the funniest bits of snake oil are cleaning compounds which remove from CDs the mould release compounds that aren't actually there!).
melorib
Lowrider
I hope my SACDs are not double layer, how do I know if they are... 
Bob Patefield said:
No Sir!
ALL CD lasers are in the infra-red spectrum the range is 760-790nm.
melorib
Lowrider
9designs said:
Hmmm... I lathed all my SACDs, many are hybrid...
may be we should use indocyan green .....as the ir absorber
and of course plants don't absorb Ir either ?
I presume mosfet has not heard a lathed cd, seen or read about the lathe operation. If he had, he would know why and how these problems are avoided.
and of course plants don't absorb Ir either ?
I presume mosfet has not heard a lathed cd, seen or read about the lathe operation. If he had, he would know why and how these problems are avoided.
zanash said:
If you understood Digital Audio and read an excellent publication like
Ken Pohlmann -- Principles of Digital Audio
You will realise the folly of this product
melorib
Lowrider
Here we go again, live and let live...
Why is the naysayers always want claim their right and everyone else is not only wrong, but must be imagining things as well.
All from the position of IMO
a never having used the unit let alone heard the results
b guessing as to the results ..as they read one or two texts on the subject. So must know everything
c turning down all attempt to try it ..as they know it can't possibly work
d telling porkies ...when they do hear it, they can't tell any difference
these of course are generalisations.
As those that know me ...I never post on subjects that I have no experience with...unlike some !
All from the position of IMO
a never having used the unit let alone heard the results
b guessing as to the results ..as they read one or two texts on the subject. So must know everything
c turning down all attempt to try it ..as they know it can't possibly work
d telling porkies ...when they do hear it, they can't tell any difference
these of course are generalisations.
As those that know me ...I never post on subjects that I have no experience with...unlike some !
I dont own one of these products but a gentleman whom I work with does. It makes no difference.
But much more importantly let me point you to the Digital encoding and reply portion of the book I mentioned, I dont have it to hand so cant give you a chapter number. Please pay special attention to the design and implimentation of the laser pick up mechinism. Then read and FULLY understand the Reed Solomon alogrythims. Once you have done this please explain how, by treating a disc, with the product you mention, this will reduce the UNCORRECTED bit rate that is coming off of the disc.
Then can you show how this will make any difference to the standard UNCORRECTED bit rate from an untreated disc.
I will give a little help here. The standard uncorrected bit rate for a disc in reasonable condition is between 5-25 bits for the entire disc.
A supplementary question for you. How bits of data are on a standard audio CD?
But much more importantly let me point you to the Digital encoding and reply portion of the book I mentioned, I dont have it to hand so cant give you a chapter number. Please pay special attention to the design and implimentation of the laser pick up mechinism. Then read and FULLY understand the Reed Solomon alogrythims. Once you have done this please explain how, by treating a disc, with the product you mention, this will reduce the UNCORRECTED bit rate that is coming off of the disc.
Then can you show how this will make any difference to the standard UNCORRECTED bit rate from an untreated disc.
I will give a little help here. The standard uncorrected bit rate for a disc in reasonable condition is between 5-25 bits for the entire disc.
A supplementary question for you. How bits of data are on a standard audio CD?
melorib
Lowrider
Use your ears, to listen to music... :SLEEP:
