I get 0 noise/hiss with my Yamaha active speakers plugged into a creative Z SE using a 5ft 3.5mm stereo to dual mono unbalanced TS cable
Router gave electrical interference when sat on the desk but went away after I moved the router 8 inches higher. (its still next to the speaker, just not directly next to where the amps must be inside the speaker)
@JRJ
You need a 3.5mm stereo to dual mono cable.
The 3.5mm stereo jack connects to the front channel audio jack on your motherboard.
the other ends connect to the speaker.
usually XLR and TRS on studio monitors. TRS is better when connected to a PC soundcard. as soundcards output an unbalanced signal and TRS inputs take both balanced or unbalanced, the unbalanced TRS connector is called TS its a 1/4 or 6.35mm connector that looks lie a giant 3.5mm headphone jack.
normal hifi speakers aren't designed for nearfield listening like sitting at a desk.
for connecting a pc to TRS you would need
https://www.amazon.co.uk/dp/B07VFNWSB7?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
and your speakers should be isolated from your desk so sitting on some of these
https://www.amazon.co.uk/dp/B08DCF3F7P?ref=ppx_yo2ov_dt_b_fed_asin_title (the flat part contacts the desk)
Tweeters should be ear height though and with the speakers aimed at a spot directly behind your head for studio monitors, so you might wanna just get speaker stands with adjustable tilt
BTW if you look at Yamaha speakers since I mentioned having them, make note the price is PER speaker, they are sold individually
Also if you buy a different version of the Y cable I linked above, make sure you can see where the split is on the cable.
Some of them the cable might be 5ft long, but the split end will only be a few inches so useless for speakers.