Subwoofer making a low buzzing sound when turned off?
 

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..?

Sounds like a ground loop. Those can be very hard to track down and diagnose or fix. Try plugging it into a different electrical socket. Or try plugging it into the same socket your computer is plugged into if it isnt already. I guess the best bet would be to make sure every device that is connected to your computer is plugged into the same power bar.

It's all plugged into the same surge protector.

Edit: actually I don't even have the laptop plugged in there at the moment. The system is turned off just sitting there and the audio jack is just laying across the desk. I even lifted the jack up off the desk to make sure the buzzing sound wasn't because the audio jack was touching something.

Also tried plugging the system into various other outlets and it still does the sound..

Is your computer connected to a tv that is connected to cable tv?

Basically you need to start disconnecting things one by one to see if the humming stops.

Unplug the cable from the system completely and see if that does anything. If you have everything disconnected from the audio system except power and it is still humming then its probably defective.

Also try plugging directly into the wall with nothing else connected. (No power bar) If still humming its defective or worst case scenario bad wiring.

Nothing else ever connected to the laptop or anything. I just use it play music from my laptop.

Exactly what's happening. Also just plugged the systems audio jack back into my laptops headphone port and it has no effect whether plugged in or not.

Guess the setup has just seen better days? Heh.

turn your avatar 90 degrees counter-clock wise, it will solve the problem

Not gonna happen. :upsidedow




"Sittin sidewayz, boys in a daze.."

Got this...

Logitech Z506 5.1 Surround Sound Speakers 6Piece Black 980-000430 - Best Buy

and my sub had a hum, mine was more from the modem/router being to close to it, moved it away and hum is gone, don't think magnetically shielded too well. :2 cents:

Here's what I have.

Basically the same thing. I don't have a router or anything close to it. Just a printer..

I was considering maybe a squirrel or mouse had moved into your subwoofer. After looking at some of the posts here im pretty sure im on the wrong track.

nice, I didn't go crazy on the computer as went crazy on my home stereo. Debated buying this...

SoundSticks III | Stylish Computer Speaker System | Harman Kardon US

probably more based on looks instead of the 5.1 logitech

NSA is listening in!

is the hum coming from the speaker or the amplifier? if it's coming from the amp it could be the transformer beginning to crap out.

is the cord 2 prong or 3 prong? could be a grounding issue starting here

how close is the sub to your electronics? could be an interference issue

that's all i got! :thumbsup

Sounds like the power supply is starting to go...

Best answer. Aren't the coils in the speaker picking up a loose 50Hz signal transmitted from somewhere? These hums are a huge problem, Paul Simon and Philip Glass sat down and wrote/composed a very grandiose song about the problem;

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.

Always and it is so annoying... :)

hope they like panasonic

I changed my system because of similar problem