I think the onboard sound that is on the newer motherboards sounds great. Alot of people dont notice a whole lot of difference between onboard vs a soundcard. I cant comment though on the issue if you are using high end headphones.
If you buy a sound card for those speakers, don't buy anything higher than a Xonar DG. I personally think you'll hear a difference, even with Logitech speakers, but can't make a promise. That's why i think you should go no higher than a Xonar DG. Cheap, will max out an audible difference for those speakers and..oh yeah, cheap.
Also, a good headphone setup will be much cheaper than an equally good speaker setup.
Sound cards aren't necessarily bad, but inside a computer isn't exactly where high end audio belongs. An external dac/amp will always provide much better sound than a sound card... though it will also cost more. A decent pair of headphones and good sound card is probably the direction you will want to head. It will be relatively affordable and also sound great for the price. If you feel like you are missing something your next upgrade would be external equipment.
I'm in the same boat and i have klipsch pro media 2.1 speakers. Same motherboard also. What card would you recommend. It's mainly for gaming and listening to classic rock. Sorry to steal the thread, don't mean to be rude.
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