I just picked up a pair of Yamaha HS80M monitors but have been greeted with crazy buzz/hum when swapping them into my setup.
It seems that everything electrical affects it, too.
I have swapped over every cable, tried every power socket and combo I can think of and while the hum does differ, it is still very much there.
Maybe I have dirty power in my room - but why is it JUST these speakers that are affected by it so much??
If everything is unplugged from them, they are fine as silent as they should be. If I plug something in while it is off, they buzz a bit. If i turn it on, they buzz like hell!
Computer, PC screens, POD HD, interface etc. Everything affects it in some way.
I had some tapco S8s before these and they are fine
Seems a fair few people have this problem:
To Hell and Back w/ Yamaha HS80m - Gearslutz.com
I will some of the suggestions in this thread and see what happens. Don't want to remove my earth though!
What do you have the output level set to on the monitors themselves? Are they 100% cranked?
Shielded cable vs. Unshielded - is there a difference in the amount of noise?
Have you tried the XLR input vs. 1/4"?