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Just bought one of these guys, and it's able to stream 1080p video across my house, but now there's a soft buzzing noise coming from my speakers. I'm guessing it's interference from my powerlines? The picture OTOH looks to be perfect quality.
How do I fix it? Is it a faulty device? Do I need to run it through a power cleaner? Is it unavoidable?
One outlet is attached to one of the adapters and nothing else, the other one shares an outlet with my TV.
The fault is not in the Ethernet part of the path (and not in the part where ethernet is carried over powerline conductors) but most likely improper earthing of the audio section.
Keep in mind that the data coming over the ethernet (powerline or otherwise) is digital and packetized and as such is impervious to picking up powerline buzz. Powerline issues could cause problems, but they would be connectivity issues. The data either comes though unchanged or you don't get data.
You need to look elsewhere for the cause of the buzz
Searching for the same issue, I came across the fact that this is indeed most likely an issue with ethernet-over-power.
The ethernet-over-power pollutes your main current (as it modulates it) with small changes in order to transmit data. These small changes are then propagated into your audio equipment, which interpret them as sound that should be amplified.
So while what uSlackr writes about data that is digital and packetized being flawless is true; the buzz still comes from the ethernet-over-power due to interference on the main current.
To solve this, most people seem to install an ups/powerline conditioner on your audio equipment to make sure they filter out the bad current.
