Interesting articles on screening and tweaking the Creative sound cards.
Direct translation
Trouble all "cheap" sound cards from Creative, and this is not just the low-quality operational amplifier mounted on the frontal outlet. - JRC4556A, In our case, this is JRC4556A, whose sole asset is the high weight capacity of Io = 70mA, which allows him to work directly on the headphones of any resistance.
Change it to OPA2132UA.
Also on fake LM1875
Direct translation
Trouble all "cheap" sound cards from Creative, and this is not just the low-quality operational amplifier mounted on the frontal outlet. - JRC4556A, In our case, this is JRC4556A, whose sole asset is the high weight capacity of Io = 70mA, which allows him to work directly on the headphones of any resistance.
Change it to OPA2132UA.
Also on fake LM1875
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