Originally Posted by Lagerfeldt
Lagerfeldt, did you listen to the files I posted? iTunes 10.1 stereo image is F'd. Here's proof.
You don't need a null test to figure out there is something going on. The differences are not subtle.
On previous versions of iTunes I didn't have this problem and I would agree that it simply plays back the file as it should. It would null with QT, no doubt. On 10.1 with MY (and many others) system, there is zero doubt in my mind that something is wrong with it's playback. All you have to do is listen to the files to here the difference. It is immediately evident. I'm not saying QT is a more accurate player by any means, but I AM saying something has changed with 10.1 that effects accurate playback... it is an obvious problem on SOME systems. I'd like to figure out what that common thread might be.
Can anyone that listens to the files from the player in my post honestly tell me that there isn't a HUGE discrepancy? If you listen to the guitar at the very start... iTunes places it about halfway between center and right. QT places it full right.
**possible cause found**
I did a little further testing today and found some odd things going on....
If I switch output devices from LINE OUT to RME or vice versa while iTunes is open, I get a narrowed image. QT is perfect regardless.
BUT, if I do not switch output devices from LINE OUT to RME while iTunes is open... THERE IS A PERFECT IMAGE from both devices! If I close iTunes, change output device and then reopen iTunes, there are no issues. This is NEW behavior in 10.1. It may also be the reason why some people do not have the issue; they are simply using the same output device (always LINE OUT or always their chosen interface) each time they open iTunes.
SO, it seems there is simply an issue with changing output devices while iTunes is open. This behavior doesn't exist when using QT; I can switch at will without any ill effects to the stereo image.
Kind of a PITA, but at least I know I can get around the issue!