Custom bit rate of 192kbps coming out as all sorts

Started importing some more CDs today and the bit rates for the imported files are showing anything between 187 and 195 kbps ?????
The rest of my library shows as 192 kbps all 4000+ tracks.
Anyone explain, as I have not got variable bit rate selected in preferences ( that was my first thought ).
It also happens on converting too.
Message was edited by: Airsculpture

As far as I know, Apple's implementation of AAC never had a true "constant bit rate" (CBR) mode. AAC files encoded by iTunes have always varied slightly, even dropping the bit rate close to 0 kbps on portions of "digital silence." You can verify this by opening an old AAC file in Quicktime and selecting "get info" to view its actual average bit rate. Previously, iTunes simply displayed your target bit rate. I don't think there has been any actual change in how iTunes/Quicktime encode CBR, it is simply that it is being displayed differently.

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I'm new to iTunes. I already downloaded 3 songs when I realized that the default bit rate is 128Kbps. I tried changing the bit rate to 192Kbps with a (Variable Bit Rate) checked.....unfortunately when I downloaded the next 2 songs the bit rate turned out to be the same.
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I've customised my CD importing bit rate to 192kbps. However, when importing songs they can be anything from 180-195kbps when stored. This started all of a sudden - I have 4000 songs at 192kbps. Any ideas?

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Hi, Ed. I am running iTunes 9.0.3.15. When I click custom, the settings description in the details box display what they were before this thing happened = 112 kbps (mono)/224 kbps (stereo), VBR, optimized for MMX/SSE2. The pop-up dialogue box that used to appear (where you could choose the specific bit rate from the drop down menu) does not appear at all.
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As noted in the first post, both of these newer USB DAC work fine at 24/96 on my wife's iMac, so it's clear that they didn't both become defective when I connected them to the Macbook Pro at the same time.
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Custom bit rate of 192kbps coming out as all sorts

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