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I use the AF100 in my car with Rockbox and I have noticed no difference in sound quality. The crackling I think is because the AF100 is easy to overdrive, you have to lower the volume to about 50%-60% on both the iRiver FW and Rockbox.
One thing though, I use the line out jack to connect the AF-100. If you're using the headphone jack, you could try the line out jack to see if it makes a difference.
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