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4-47] Audio discs have crackling sounds on the last few tracks




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This article is from the CD-Recordable FAQ, by Andy McFadden (fadden@fadden.com) with numerous contributions by others.

4-47] Audio discs have crackling sounds on the last few tracks

(2002/08/06)

A not-uncommon complaint is:

"I've made lots of audio CDs. They sound fine in my computer or home
CD player, but when I put them in the car they have lots of static."

A variation on the theme:

"...the static is only on the last few tracks."

Or, more rarely:

"...the discs sounded fine for a couple of weeks, and still sound fine
on most players, but they sound really bad now in the car. The more I
played them the worse it got, to a point."

There are a few things going on here. First and foremost is media
compatibility. The combination of recorder, player, and media just
isn't working. Unless you're willing to change your player, the easiest
thing to do is change the brand of media you're using.

The reason tracks out past the N minute mark (typically 40) sound worse
might be due to speed changes. For 1x audio playback the player is in CLV
mode, so the disc is spinning more slowly near the outside of the disc.
(You'd think that'd make it easier, not harder. Go figure.)

You should make sure that it's a problem with writing and not with reading
tracks near the edge. Try writing the tracks in a different order. A good
way to do this is to extract the tracks into WAV files with a reliable DAE
program (EAC, from section (6-2-12), works well). Play them from the hard
drive to make sure they extracted well, and then record them onto two CD-Rs,
using a different track order for each. If the problem is always on the
last track then the disc is being recorded poorly.

The slight deterioration of the media after being played a few times
isn't expected, but does seem to happen with some discs. It appears that
the compatibility between the discs and the player is marginal to begin
with, so a slight degradation in error rate on the disc results in a
dramatic increase in noise during playback.


 

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