Speaker cable routing leading to buzzing speakers.
We have had to add some speakers to our PA system in the hall and they buzz like crazy. When plugged into an amp away from power sources, they're fine but due to the way our stage is laid out, the cabling runs past power sockets etc... and therefore the buzz appears.
Any ideas how we can resolve this? Are we going to have to bite the bullet and start crawling around under our stage in order to route the cables via non-power interfering routes (will be a big faff).
Or is there such a thing as shielded speaker cable?