audio amplifiers for PC's

Hello,
I am looking to design a digital audio amplifier for my
computer.My computer has a built in sound card which does not produces
good sound effects more over i have low end 2.0 mercury speakers which
makes the sound more worse.can any one please tell me about some sites
where i would get complete circuit diagrams for desigining such a
digital amplifier.
Also any design ideas from members is welcome.But to be precise i
want something that has great sound quality(rather must have superb
sound quality),with some features like digital bass boost,sound
synthesis,surround sound etc.I know with all these features the
circuit might become expensive but if any one can help me by
suggesting something that can include all these features and still
economical will be really nice.
Just to remind that i want this circuit to be placed between my
pc and speakers i cant afford to replace either of them.
regards,
Thankyou
.

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