I have a problem that has been annoying me quite a bit lately. The problem started when I moved the transmitter for my Sennheiser wireless headphones from the living room to my PC so I could easily switch between the PC and the receiver. It may be difficult to explain this without making it confusing.
Here is my previous setup: TV > Receiver > Switch > Transmitter
The switch selected either the reciever or the DVD player for playback through the headphones. The problem was that I could not listen to the PC without switching several wires around. The PC was connected via a 40ft RG-6 cable to the coax digital input on the receiver. I got perfect sound from the PC through the receiver.
Now here is my current setup: TV > Receiver > Splitters > 40ft RG-6 > Switch > Transmitter/PC -
HERE is a crude diagram.
Now I can play music from the PC using the digital input on the receiver with no problems. By flipping the switch and switching one cable I can listen to the PC through my headphones. It all works fine except for one problem.
Whenever the PC is even indirectly connected to the TV there is a persistant 60hz hum that I can even hear over the sound at moderate volumes. There is also a hum in the headphones. The thing is, this happens even when the switch is in a different position and supposedly not making a connection to the PC. If I disconnect the receiver from the PC the buzz in the TV speakers stops. If I connect the PC to the coax input on the receiver there is no buzz. The buzz is there when TV speakers are turned all the way down or on mute (I never use the TV speakers).
The living room and kitchen (where the PC is) are on different circuits. Both of which are properly grounded. When the PC is plugged into the same powerstrip as the receiver/TV the hum is still there.
Does anyone have any ideas?
