|Your sound card will either be an onboard type or a regular adaptor card type.|
If your card is onboard:
there will be the usual 1/8" plugs on the back of your computer
for MIC, LINE IN, SPEAKER. They might be black plastic or red, blue, green. Anyway one of
those external connectors is where you plug in your speaker.
Open your computer and there will be some cables that run from those external connectors,
back to the motherboard. Near where those cables plug into the motherboard will be your
audio chip. Get the info off of that chip.
If your card is a regular adaptor card:
Same deal, just look at the card at the back of the computer where you plug in your
speakers. Open the computer and that is your sound card. Some manufacturers put a
model number on the card, some don't. If there is no model number look for the biggest
chip on the card and write that info down.