Bit rate for WMA files

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Yes there is an enourmous difference between 128Kbps and 192Kbps (listen for yourself!). I wouldn't rip any music at less than 192Kbps. In fact, I would recommend changing the rip settings in Windows Media Player to mp3, then ripping at 256Kbps if you can afford the disk space. But certainly no less than 192Kbps.