I'm running an extention lead from one side of the room to the other. I tried three with identical results. A 20 metre 10 yr old RCA lead, about a 3 metre new RCA lead, and a high quality 3.5mm to 3.5mm cable with a gender changer at the other end.
I cant actually set up the speakers directly by the Mac and plug it in directly, because I dont have enough power points or room near the desk. (arghh)
These are 5.1 speakers, so I tried unplugging the orange and black leads, as it says in the manual that green is suitable for stereo sound from a computer..
I dont get this problem with my high quality headphones, or my $3 computer speakers through the Mac. It's not a BIG problem, but I'm wondering if I should return these just in case theres a fault with the speakers. I'm leaning towards the Mac just being weird though.