
Which model X-Fi are you using?
If it has an optical output, you can connect the Fiio E17 with an optical cable, so you would be able to take advantage for the E17's WM8740 DAC chip
And still get CMSS-3D headphone surround sound thru the optical to the E17.
If your current X-Fi do not have optical out, you can get a refurb Creative Titanium (non-HD) for $44.
http://www.newegg.com/Product/Product.aspx?Item=N82E16829102043
I have the X-Fi Titanium HD: http://www.newegg.com/Product/Product.aspx?Item=N82E16829102033



























Just remember, that phase is due to the output impedance mismatch.



