In my case, I can honestly say that it was the Prelude that solved my problems. If I had my master volume set even at 50% on the XtremeMusic, I would get crackling in any sound including windows sounds

. I've tried updating drivers, reinstalling drivers, removing components, changing PCI Latency, overclocking PCI bus......everything I did would not solve this issue. My only workaround that I figured that help me was lowering my Wav volume to 50%, and Master Volume to about 35% on my XtremeMusic. I've kept the same exact configuration while switching to Prelude and I am completely SCP free.
A big YMMV on the whole issue. They say that Creatives manufacturing varies so much on the components they use (while keeping the X-Fi chip the same) and I don't doubt it. I am just glad I am running crackle free while enjoying all the audio improvements the Prelude has
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