🚀 go-pugleaf

I've been trying to get a better feeling for sound by connecting my G3
to my HiFi setup. As soon as I connect the cable to the jack at the back
of the computer I get a humming noise through my hifi-speakers. My Uncle
claims that the cable possibly runns to closly to the G3 picking up
extra noise before getting amplified. I've tryied twiecking the cable to
elliminate the noise. But the humm is still there. And it doesn't get
any quieter just by looking at it.
My question:
What cable would be protected by the noise? Would a coaxial cable do?