Re: [ARSCLIST] "Space" on CD's...

[Jerry Hartke <jhartke@xxxxxxxxxxxx>]

CD-R describes a physical structure while CD-DA is a logical structure.

Both CD-R and CD-RW contain pre-grooves. Replicas do not.

The presence or absence of pregrooves for CD-DA media depends on whether
they are recordable/rewritable or are replicas.

Jerry
Media Sciences, Inc.

> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:ARSCLIST@xxxxxxx] On Behalf Of Marcos Sueiro Bal
> Sent: Tuesday, December 11, 2007 8:21 AM
> To: ARSCLIST@xxxxxxxxxxxxxxxx
> Subject: Re: [ARSCLIST] "Space" on CD's...
> 
> Mike,
> 
> Fascinating! Thanks for posting this.
> 
> Do you know if there is a difference between CD-Rs and the old consumer
> CD-DA format, which supposedly has "pre-grooved" media? I have heard
> reports of these sounding better and/or being less error-prone.
> 
> Marcos
> 
> Mike Richter wrote:
> > Roger and Allison Kulp wrote:
> >> Question:
> >>
> >> Is there a degradation in sound quality in burning a CD,rather than
> >> listening to the audio directly on your computer ?
> >
> > If one begins with audio with redbook parameters, the CD and the file
> > should sound the same on the same equipment. However, in practice you
> > can get different sound depending on the hardware and its software. In
> > one case, you can get a difference between the analogue outputs of the
> > CD-ROM drive and its digital output. I.e., using the digital output to
> > your sound card's DAC can differ from either the analogue output of
> > the drive or its headphone output. Two different CD players may sound
> > quite different on the same disc due to their different ways of
> > converting the digital stream to audio.
> >
> > There is a second factor. At one time, Philips specified a performance
> > difference between a pressed and a home-made CD-DA. I captured that
> > (the page is no longer on the original site); you may read it at
> >   http://www.mrichter.com/cdr/primer/losses.htm
> >
> > Mike