My MSI MAG Z790 motherboard supports rear channel speakers.
If I were to mount a pair of speakers behind me, that would require approximately 15 feet (4.5 meters) of speaker wire from my PC to the speakers. Do I have to worry about the AUX port’s power output if I were to use 18 or 16 gauge speaker wire?
Unfortunately not, the motherboard only has a preamp. Those ports output a line level signal and the speakers are expecting speaker level which is post-amplification which is a MUCH stronger so it will be extremely quiet - if not completely silent
You can buy a cheap 2ch amp but I think you'd be better off with different speakers. It wouldn't be a bad idea to get a second set of whatever you're using for the front speakers to match the sound profile
Thanks for the advice. I got a cheap amp, got it all set up, and it works a charm!
Nice!! Enjoy your surround sound