americanaudiophile :
If your PC doesn't have separate green (for the solo9c) and orange (for the sub) analog audio outputs then you can get a soundcard that does. The DACs in the speakers aren't going to be better than the ones in a decent or even cheap card so likely the quality will improve. Set to 2.1 it removes bass from the speakers so they can play louder and sound clearer. It also sends bass to the sub which can be adjusted to the room and your taste.
After researching a little bit more, my motherboard has a decent built in soundcard with some "protection" n stuff, you can see more details on Asus site https
/www.asus.com/Motherboards/MAXIMUS_VII_RANGER/
It supports multi streaming and some more things, pretty good, it has a C/Sub jack and Rear and Front audio jacks, usually when I used to connect my speakers with RCA I connected them to the middle upper jack which is "Rear" jack.
Optical cable can not work with another analog port (pretty sure), I have no problem switching again to RCA on my speakers.
And I got one more question before going ahead and ordering the sub - From what I understood there are two options to connect the sub and speakers together, buy a spliiter like this
https/www.amazon.com/Belkin-Speake...dp_ob_title_ce
then connect both (sub + speakers) with RCA to Aux cables, or use RCA to Aux with speakers only and use another SINGLE RCA Cable (Or coax cable ? Please tell me which) directly to LFE connector on the subwoofer ?
Which option would work the best ?