itunes 11 poor audio quality

I confirm the quality issues. The sound quality with itunes is terrible when playing mpeg4 files. VLC produces a much better sound quality than itunes on the same computer.

Just recently I plugged in a USB phone and unplugged it, and since, everything playing through iTunes sounded like really poor tin-can mp3 quality. I fixed it. I went to Finder>(Your User)>Library>Preferences. I found com.apple.iTunes.eq.plist and com.apple.iTunes.plist and dragged them to the trash and emptied the trash. Reopened iTunes and worked fine again. iTunes create new (non-buggy) preferences file. You probably have to set any presets you liked before, but at least it doesn't sound like a tin-can!

Hope that helps. I'm actually pretty comfortable with the new interface. It took a while to get used to, but now I know where everything is.

Hey MakeYourOwnPizza, I did what you suggested and it fixed my sound issue. Thanks.

Ey! This made it a lot better! thank you, and I will make my own pizza!

I was having this problem too. Drove me nuts for hours.

Mac OS 10.9. iTunes 11.1.2.

For some inexplicable reason, playback of exisiting files suddenly sounded terrible, scratchy and distorted, as if they were over-modulated or the pre-amp was cranked up to high.

These same files had always played fine.

I opened the iTunes Equalizer, un-checked it and the problem went away. Re-checked equalizer, the problem returned.

I was able to 'fix' the problem by messing with the equalizer setting, basically just checking and un-checking EQ with differeent pre-sets and changing the pre-amp setttings (high / low) then reselecting default EQ presets.. So far so good. Fingers crossed.

Good luck!

Has anyone been able to figure this out? I have the same issue and I'm extremely frustrated! Here's what I've tried: I've used MIDI in a few different ways, even making an aggregate device using the internal output and Boom app. I've configured Hz, frequency, audio, etc moving around device after device. I've reset my PRAM a couple times. I downloaded BitPerfect, tried changing the equalizer in both iTunes and Boom, changed the internal clock, etc. I'm at a complete loss! Someone please tell me you figured this out! Thanks 🙂

Hi! Go up and see what "MakeYourOwnPizza" did. It worked perfectly for me! just delete those 2 files.

I thought apple would fix this terrible problem by now, apperently not, if you're still having problem i mean... If you didn't try updating to the latest version of itunes, do that first.

Stay Heavy!