[s-cars] creating CDs for the Audi/Bose system

[Igor Kessel]

Olek wrote:
> Close, very close to true.
>
> It is a common knowledge that CD's are burned and read by using a laser beam (ok, factory
> CD's are made by stamping, but master stamp is burned by a laser anyway).
>
> The laser frequency have to mach in burner/player in order to get reliable player.
> And those frequencies are different for plain CD's, CDR's and CRRW's.
> I do not remember the numbers, but frequencies for CD and CDR are relatively far apart,
> and frequency for CDRW is in between.
>
> Consequence: new players that are being advertised as CDR/CDRW compatible have 2 (or sometimes
> 3) lasers to be able to operate on all types of media. Old (and new but cheaper) players
> have only one laser that they are trying to use for all the medias. And here result is
> unpredictable: some players may handle it better than others, they might like some media
> more etc etc. Since laser frequency used to burn CDRW is closer to plain CD frequency than
> CDR, there are higher chances to play CDRW in old/cheaper players than CDR.
>
> Bottomline: try using CDRW. If your problem will go away - than you know what is
> happening, right?
>
> Disclaimer: I am not working in CD industry, so all this information is truely AFAIK.


That's a very interesting piece of info, Olek. Thank you.
It explains why my ancient 4x oversampling Denon CD player (made ca.
1988) sometimes refuses to read home-made Cds.
OTOH I have almost no problems playing them in the 6-disk OEM player
(made by Alpine, if I understand it correclty) in my '97 UrS6 .

--
Igor Kessel
two turbo quattros