Summary: I bought these speakers to replace old Logitech Z-10s. As soon as I attached them, I noticed a very annoying "buzzing" from the speakers (the tweeter stacks, not the bass). Changing the placement on my desk makes no difference, and there are no appliances or other possible sources of interference anywhere near them. I've also tried different power sources and different cables, but it has not fixed the issue. I've never experienced before with any other set of speakers.