AFAIK Crystalizer is meant to "improve" MP3s through some psychoacoustic EQ tricks. I don't use it since I primarily listen to FLAC and none of my MP3s are <192kbps.
The only time I turn it on is when i have some jazz going through my speakers and really want the percussion to shimmer(does make the cymbals sound really nice)... I'd never use it with a headphone setup, I believe some people did tests and proved that the crystalizer actually degrades sound quality.
X-fi does internal resampling to 48KHz. Normally your files are 44.1 KHz unless you ripped them from DVD-A. Bit-perfect prevents this resampling. You don't really have to bother, since the X-fi resampler, unlike the one in Audigy 2, is very good--the signal to noise ratio is -130dB (!!!)--but some enable it (bit-perfect output) just for the peace of mind (myself too
Originally Posted by Ahriman4891 /img/forum/go_quote.gif X-fi does internal resampling to 48KHz. Normally your files are 44.1 KHz unless you ripped them from DVD-A. Bit-perfect prevents this resampling. You don't really have to bother, since the X-fi resampler, unlike the one in Audigy 2, is very good--the signal to noise ratio is -130dB (!!!)--but some enable it just for the peace of mind (myself too
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