AVS Forum Special Member
Join Date: Feb 2016
Location: Danbury, CT, USA
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You'd get better information if you provided more information about your PC.
Most PCs have onboard sound. The output connectors are 3.5 mm. (Same size as used for home headphones or earbuds.) The one for stereo sound is green. What sort of connection does the Logitech system use?
I'm not sure whether direct links to retail sites are permitted here. Check out the Dayton DTA-120 at Parts Express. It's a small, fairly inexpensive, class T amp. It can use a 3.5 mm input, so you could connect it to your PC with a cable with male 3.5 mm stereo connectors on both ends. It also has a headphone output jack.
You could combine them with a pair of Dayton B652 Air speakers. They are supposed to be pretty good for their price.
To connect the speakers to the amp, I suggest Amazon Basics speaker wire. Buy some inexpensive wire strippers, and loose banana plugs. For the plugs, I like Sewell Deadbolts: simple to use, and the wires won't pull out easily.
Be careful, though. You're stepping onto a slippery slope. It's easy to be drawn into endless upgrades, costing hundreds or even thousands of dollars. Some of the better Logitech all-in-ones give pretty good sound, for their price.