Logitech Z906 or Sound card cuprit?

ronweb1201

Distinguished
Feb 6, 2012
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18,510
Hello,
I am not satisfied with the sound quality of my new Logitech Z906.
However, I am hoping the problem is with the sound card (which is the onboard "Realtek HD").

Will a good sound card help? Like the Asus Zonar Essence STX ?

Even if the speaker is at fault, will a good sound card give me a noticeable boost?