More CD madness

Man of Honour
Man of Honour
Joined
23 Dec 2002
Posts
10,325
Location
London
Now you're really going to think I've lost it. This really does follow on well from my attempt to justify why higher quality cables "can" make a difference.
Just received one of these:

audiodesk1.jpg


swartz1.jpg

In short, it's a lathe for CDs. I get the impression that the logic is that CDs are not that well pressed, and the result is that many are unbalanced, a little like a car tyre. Spin it at 500rpm, and you get wobble (as you would through a steering wheel). The more wobble you get, the harder the error correction and CD laser has to work, and the worse it sounds.
Well that's the theory.

In practice, takes about a min to lathe a CD and apply black ink to the edge, so at least it's fast and easy.
As for the actual difference, frankly it's hard to believe. Really does reduce general hash and grunge from the mix, resulting in improving dynamic range, and thus how obvious the musicians are. The implications are that it simply sounds like the band are that much closer to being in your room. I can't say I'd recommend it for use with kit from RS, but for those with fairly expensive kit, and where improvements are getting substantially more expensive, it's money well spent.

I'm told that it works with any disk based format, including DVD, so I'll be trying that sometime in the near future.

It's OK guys, send the boys with the straight jackets around later on....
 
Last edited:
So what exactly does it do? Trim the edge of a CD so that its perfectly balanced hencd reducing jitter etc? Wouldnt it make a larger difference on cheap CD players where they have poor error correction?
 
You have to be kidding me!

Do you have a glass of pebbles on top of your amp? How about putting tinfoil in your freezer and then draping it over your speakers before listening?

You can put a centimetre wide hole in a CD and still get a bit-perfect data stream from it...
 
DRZ said:
You have to be kidding me!

Do you have a glass of pebbles on top of your amp? How about putting tinfoil in your freezer and then draping it over your speakers before listening?

You can put a centimetre wide hole in a CD and still get a bit-perfect data stream from it...

Really? How does that work? I know you know your stuff(read a lot of your posts) so just interested :)
 
DRZ said:
You have to be kidding me!

Do you have a glass of pebbles on top of your amp? How about putting tinfoil in your freezer and then draping it over your speakers before listening?

You can put a centimetre wide hole in a CD and still get a bit-perfect data stream from it...

Oh really, I guess thats why DRM CD's which break the error correction dont play well when scratched.

Sure in CD rom mode, there are additional checksums, and data correction techniques as computers are very intolerant of errors. But CD DA is reliant on reading the disk in 1 try, and then filling in the blanks with error correction. It doesnt care if its exact, it makes a best guess(musically speaking) and then moves on. True good CD transports are pretty good at getting the CD DA from the disk, but there's no harm in making the job easier. Reducing the error rate would likely help the laser track past physical defects in the disk without skipping as a bonus/side effect.
 
Corasik said:
Oh really, I guess thats why DRM CD's which break the error correction dont play well when scratched.

Sure in CD rom mode, there are additional checksums, and data correction techniques as computers are very intolerant of errors. But CD DA is reliant on reading the disk in 1 try, and then filling in the blanks with error correction. It doesnt care if its exact, it makes a best guess(musically speaking) and then moves on. True good CD transports are pretty good at getting the CD DA from the disk, but there's no harm in making the job easier. Reducing the error rate would likely help the laser track past physical defects in the disk without skipping as a bonus/side effect.

No such thing as a DRM CD. CD is a fairly specific format and since it jumped from 14 to 16 bit has barely changed. Philips are quite hot on people who insist on breaking from the Red Book do not use the term "CD". Any 120mm plastic disc isnt a CD ;)

All I can say further on the matter is that this no doubt costs a fortune and if you really, really think you can hear a difference and have the money to waste then its worth the money I suppose. I can see some sense in it at least, at the extremes of carelessness with your CDs (or just wanting to keep them in tip-top shape, which is fair enough), but there are some aspects of it that just dont sit well with the science (the painting the edges black is a good one).

For me, I would rather spend that extra money on physically getting my bum on a seat in front of the musician in question :)
 
DRZ said:
For me, I would rather spend that extra money on physically getting my bum on a seat in front of the musician in question :)

Agreed, however it might be difficult in the case of say Jimmy Hendrix, Blackmore doesn't do "rock" anymore and it's quite expensive to fly the US for some decent blues nowadays.

Have to say that I woulnd't have believed this worked until I'd heard it. It's also very consistent in improving CDs. The offers definitely open to anyone who's in London and wants a dem.

The good news is that once the disk is done, don't need to do it again.

Now, let me go and strategically place some horse manure 2 feet infront of my right speaker. I'm told that should help sibilance...
Before you ask, can't be just any old manure. Needs to from a specific type of horse, only found on the urals, meaning that of does of course cost £1000 a kg.
 
Last edited:
I was thinking that the ink on the edge might simply be added to ensure that there was no comprimise of the seal between the disk layers at the edge after its been lathed, or perhaps just as a mark to show you that you've already done the disk.

You know there is no such thing as a DRM CD, and so do I, but try telling that to sony/bmg, or several other music companies. Luckily the fad of adding DRM to 120mm disks is fading, and most music companies never used it in the first place.
 
So what was that fabled Sony/BMG pressing that caused all of the problems in the first place then if it wasnt a DRM CD??

Not being difficult just enquiring - or was Sony able to do it being the joint holder of the Red Book "definition" with Phillips?

I have actually heard of this kind of device before - I can see the logic behind it but whether it actually works is probably more down to the type of music and quality of recording potentially
 
Seems quiet interesting tbh. The quest for sonic perfection goes on! How much do one of those cost btw?
 
Mr_Sukebe said:
Agreed, however it might be difficult in the case of say Jimmy Hendrix, Blackmore doesn't do "rock" anymore and it's quite expensive to fly the US for some decent blues nowadays.

i would have thought that the production values recorded from those 2 artists or any from a similar era would have been hard to improve on from lower cost equipment from today as the masters are restricted from the recording methods used.
 
If your CD player has problems with reading your CD's perfectly at 1x speed for music....

How come a PC CD-rom etc can read & write a CD at up to 52x speed perfectly without this ..



I think you would been better off trying a new CD player first..
 
Last edited:
Back
Top Bottom