Quote:
Originally Posted by Jakez
I have a logitech desktop 5.1 system hooked up to my computer and when I turn it off there's still a barely audible buzzing sound coming from the subwoofer if I listen to it. Why is that? It has to be using some (probably tiny) amount of power still.. I don't know much about electronics so I don't understand what or why it makes that noise when it's supposed to be off..?
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Hi Jakez,
Look near your sub woofer, and see if there are any power supplies or power adapters near by, such as those used to power external hard drives or chargers for cordless phones. If so, move them away from your amp and see if the problem is still there. The cable connected to your amp input is usually low quality and not shielded well, so it acts as an antenna that can pickup RF noise from nearby electrical items such as the transformers inside power adapters.
If the problem is still there, try just disconnecting the the signal-in cable completely. If your cable is low quality and if it is acting as an antenna, the noise you hear should now disappear.
If it is still there after that, try moving the sub woofer to another location. Try just a few inches in any direction first, and then finally anywhere else in the room.
If the problem is still there in the end, check with Logitec to see about getting a replacement.