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It should be OK BUT if the JBL and the Logitech are plugged into different mains outlets you could get a hum from one or both sets of speakers. This hum is caused by an earth loop when the speakers are connect to different mains outlets. The fix. Connect a power board to a mains outlet and then plug the mains connections from both set of speakers and computer to this power board.
You may have an earth loop problem. This is caused by connecting your computer to a mains outlet and the powered speakers to a different mains outlet. If this is the case then connect the computer and the speakers to a power board and then plug the power board to a mains outlet.
You may have an earth loop problem. This is caused by connect various equipment to different mains power outlets. Connect all the PCs, audio and speakers to a single mains power outlet, use a power board so they are connected to the one mains power outlet. I suggest you use a power board that has a built-in surge protection.
Are this powered speakers connect to the same mains power socket as the computer. If not you may be getting an earth loop which causes a humming sound. Connect these speakers to the same power outlet, if you have not sufficient outlets use a power board.
If the computer and the powered speakers are connected to different power outlets then you could have an earth loop. This causes a hum in the speakers, this also apply to hi-fi sound systems.
To fix this problem, connect all the computer components to a power board and plug it into a power outlet.
Sounds like an issue with the power cable or adaptor.Take the speakers and plug them into a power socket/outlet that definitely works. If it turns on you know the power socket/outlet you WERE using is faulty. If not, then it is possible the adaptor itself is faulty and needs replacing.
hi, check all the connections,cables and replace as needed. sounds like a ground loop.also your power outlet may not be grounded or the power adapter may have issue, this could case the condition you describe.try other power outlet. you can get filters ,conditioners at like radio shack or places like that.. hope this is useful. good luck!