The Zen X-Fi actually sounds better without X-Fi turned on, in my experience. With a high quality file, X-Fi sounds worse and is very fatiguing.
Why bother with trying to restore information lost in compression, which you cannot, anyway. Just use a lossless format to begin with.
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It ONLY sounds good with MP3 songs Encoded @ 160kbps or below..
after that it ONLY messes up the sound.
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به نظر میاد X-Fi فقط برای فرمت های فشرده و با بیت ریت پایین مناسبه چون کمپانی با همین هدف ساختتش که مثلا چیزهایی که در حین فشرده سازی از بین رفته رو بازسازی کنه.