QUOTE(rohangc @ Jun 30 2004, 14:17)

I have bought a number of discs from BMG Music Club and ColumbiaHouse. I am pretty sure that these CDs contain the same data as the catalog number is the same as those CDs available in stores.
Well, just because the catalog number is the same, it does not absolutely mean that the disc pressings are identical.. I was suspicious, so I did a little test today with EAC ripping two CDs: the first was a BMG music service CD of Weezer The blue album, and the second was a CD bought from amazon.com of Weezer the blue album..
My test revealed that the discs are not identical.. First reason why, when I inserted the BMG one, I collected the track titles, then ejected the disc.. The track titles went away.. I reinserted the disc and the titles showed up since the disc had already once been recognized. Then I took that BMG disc out and put the one in that I got from amazon... The disc was not recognized automatically like the BMG one was the second time.
Another reason they were not identical-- I ripped both of the CDs, and I got different accuraterip results for both discs even though both of my rips were "ok". My confidence level for the BMG disc was 3 and the amazon was 10. That means that the accurate rip database has different info stored for both the BMG pressing and the store pressing..
I did make a point of noting the max amplitude listed for the tracks on both discs, and it was 100 on both, so I do think there is a possibility that even thought the discs are not identical, they might have the same audio.
I am hoping that there is no difference between BMG discs and the ones you can buy in stores, but unfortunately, this test has made me suspicious that the sound might be compromised on the BMG ones (since they are the cheaper).
If anyone has any info or thoughts, it would be appreciated. I wish I could do a better analysis-- maybe if I had cool edit pro I could take a look at the waveforms and try to notice some differences.
For anyone interested, here are the logs for the BMG disc:
EAC extraction logfile from 17. December 2006, 16:31 for CD
Weezer / Weezer (Blue Album)
Used drive : TSSTcorpCD/DVDW TS-L532R Adapter: 1 ID: 0
Read mode : Secure with NO C2, accurate stream, disable cache
Combined read/write offset correction : 0
Overread into Lead-In and Lead-Out : No
Used output format : Internal WAV Routines
44.100 Hz; 16 Bit; Stereo
Other options :
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks : No
Native Win32 interface for Win NT & 2000
Track 1
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer (Blue Album)\Weezer - Weezer (Blue Album) - 01 - My Name Is Jonas.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC 36C761CE
Copy OK
Track 2
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer (Blue Album)\Weezer - Weezer (Blue Album) - 02 - No One Else.wav
Peak level 100.0 %
Track quality 99.9 %
Copy CRC BE9E8671
Copy OK
Track 3
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer (Blue Album)\Weezer - Weezer (Blue Album) - 03 - The World Has Turned And Left Me Here.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC F0EC824B
Copy OK
Track 4
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer (Blue Album)\Weezer - Weezer (Blue Album) - 04 - Buddy Holly.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC FAD741B4
Copy OK
Track 5
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer (Blue Album)\Weezer - Weezer (Blue Album) - 05 - Undone - The Sweater Song.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC 48A3C343
Copy OK
Track 6
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer (Blue Album)\Weezer - Weezer (Blue Album) - 06 - Surf Wax America.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC CF74CD24
Copy OK
Track 7
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer (Blue Album)\Weezer - Weezer (Blue Album) - 07 - Say It Ain't So.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC 86E28C54
Copy OK
Track 8
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer (Blue Album)\Weezer - Weezer (Blue Album) - 08 - In The Garage.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC E57D7D96
Copy OK
Track 9
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer (Blue Album)\Weezer - Weezer (Blue Album) - 09 - Holiday.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC 0456612D
Copy OK
Track 10
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer (Blue Album)\Weezer - Weezer (Blue Album) - 10 - Only In Dreams.wav
Peak level 100.0 %
Track quality 99.9 %
Copy CRC 835D2A3A
Copy OK
No errors occured
End of status report
And here is the log for the one I bought from amazon:
EAC extraction logfile from 17. December 2006, 16:46 for CD
Weezer / Weezer
Used drive : TSSTcorpCD/DVDW TS-L532R Adapter: 1 ID: 0
Read mode : Secure with NO C2, accurate stream, disable cache
Combined read/write offset correction : 0
Overread into Lead-In and Lead-Out : No
Used output format : Internal WAV Routines
44.100 Hz; 16 Bit; Stereo
Other options :
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks : No
Native Win32 interface for Win NT & 2000
Track 1
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer\Weezer - Weezer - 01 - My name is Jonas.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC 0203929A
Copy OK
Track 2
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer\Weezer - Weezer - 02 - No one else.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC 9310AA01
Copy OK
Track 3
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer\Weezer - Weezer - 03 - The World has turned and left me here.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC 2FDD7E9D
Copy OK
Track 4
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer\Weezer - Weezer - 04 - Buddy Holly.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC 78473499
Copy OK
Track 5
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer\Weezer - Weezer - 05 - Undone - the Sweater song.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC ACCC498B
Copy OK
Track 6
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer\Weezer - Weezer - 06 - Surf Wax America.wav
Peak level 100.0 %
Track quality 99.9 %
Copy CRC 62D681F4
Copy OK
Track 7
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer\Weezer - Weezer - 07 - Say it ain't so.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC D3331E4F
Copy OK
Track 8
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer\Weezer - Weezer - 08 - In the garage.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC 4FF4C5BD
Copy OK
Track 9
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer\Weezer - Weezer - 09 - Holiday.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC AB431730
Copy OK
Track 10
Filename C:\Documents and Settings\user 1\My Documents\My Music\EAC Rips\Weezer\Weezer\Weezer - Weezer - 10 - Only in dreams.wav
Peak level 100.0 %
Track quality 100.0 %
Copy CRC 612D1AD4
Copy OK
No errors occured
End of status report