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Logitech Z-5500, low "buzzing" sound by subwoofer

post #1 of 21
Thread Starter 
Hey there everyone!

A little strange, but after I setup my system back at home, I realised when I plugged the Z-5500 sub to the wall socket a really low buzzing sound came on.
Almost like a fan, humming. It is ONLY noticeable when I put my ear on the woofer itself. Others, on Google have reported it as a really loud buzzing noise, where it was linked to the connection from the control pod to the sub. I can confirm that's not the case with me, as it is power related.

So my question is: Is this normal and can it be fixed at all?
I'm thinking fuse, or power socket wise.

The system is quite old, just about 3 years old now, thus out of warranty.

I should also mention, that with no music playing there is static noise coming out of the satellites - it is noticeable when the system is fully cranked up (with nothing playing). Without it cranked up, it is also noticeable if the room is completely quiet.

Any help would be appreciated smile.gif!
post #2 of 21

Something like that?

here's a wiki page about it: http://en.wikipedia.org/wiki/Mains_hum

EDIT:
I checked my Z 2300 set ( no idea how old it is, got it from my brother) and the sattelites and sub make a static noise as well if the volume is turned up to the max. Hardly audible though.
You must have a very quiet room or very good ears (mine aren't that great) tongue.gif
Edited by Bloitz - 12/19/12 at 6:51am
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post #3 of 21

I think the humming noise is normal and isn't indicative of any problems.  I have Altec Lansing's VS4121s, and my subwoofer does the same thing and it is just as quiet as yours.  For a short time, I was able to make it go away by upgrading to a better surge suppressor.  After a few months, the humming came back.  Then I upgraded again to an even better surge suppressor just because it was the one I wanted from the very beginning anyway.  Once again, the humming went away but came back after a few months.

 

I don't know why the humming went away or why it came back, but I've come to think of it as normal.

 

I hear a static from my satellites too, but I have to put my ear right up to them.  Otherwise, I cannot hear it.  However, my hearing is also a little damaged as well, so I believe that I would otherwise hear it a little bit while just sitting in my chair (my ears are about 3 feet away from my satellites).

 

Ever since I was little, I remember hearing these kinds of sounds coming from speakers when they weren't in use if the stereo was on.  So, that is also a helpful thing for me to consider this as a normal thing for some speakers.

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post #4 of 21
My guess is that it's from interference from power cabling crossing over to data/audio cabling or circuits. It could be poor design of the audio system itself. Looks like there's a thread here at tomshardware that might be discussing your problem. See if you can get anything from this:

http://www.tomshardware.com/forum/59706-6-logitech-5500-subwoofer-noise
post #5 of 21
Thread Starter 
Quote:
Originally Posted by Bloitz View Post

Something like that?
here's a wiki page about it: http://en.wikipedia.org/wiki/Mains_hum
EDIT:
I checked my Z 2300 set ( no idea how old it is, got it from my brother) and the sattelites and sub make a static noise as well if the volume is turned up to the max. Hardly audible though.
You must have a very quiet room or very good ears (mine aren't that great) tongue.gif

Quote:
Originally Posted by TwoCables View Post

I think the humming noise is normal and isn't indicative of any problems.  I have Altec Lansing's VS4121s, and my subwoofer does the same thing and it is just as quiet as yours.  For a short time, I was able to make it go away by upgrading to a better surge suppressor.  After a few months, the humming came back.  Then I upgraded again to an even better surge suppressor just because it was the one I wanted from the very beginning anyway.  Once again, the humming went away but came back after a few months.

I don't know why the humming went away or why it came back, but I've come to think of it as normal.

I hear a static from my satellites too, but I have to put my ear right up to them.  Otherwise, I cannot hear it.  However, my hearing is also a little damaged as well, so I believe that I would otherwise hear it a little bit while just sitting in my chair (my ears are about 3 feet away from my satellites).

Ever since I was little, I remember hearing these kinds of sounds coming from speakers when they weren't in use if the stereo was on.  So, that is also a helpful thing for me to consider this as a normal thing for some speakers.

Quote:
Originally Posted by Arimis5226 View Post

My guess is that it's from interference from power cabling crossing over to data/audio cabling or circuits. It could be poor design of the audio system itself. Looks like there's a thread here at tomshardware that might be discussing your problem. See if you can get anything from this:
http://www.tomshardware.com/forum/59706-6-logitech-5500-subwoofer-noise

First of all, thanks to all of you for replying +rep to all!

-Ok the noise, is like that 60hz, but what it really reminds me of coming to think of it is like a fish tank pump - again, i can ONLY hear it with my ear pressed against the sub. I also noticed that the sound is STILL there, even though the system is playing.

-As for the static, well I'm maybe being a bit too picky, but I can hear static when the room is quiet. I do quite a lot of audio reviewing (earphones and headphones), so maybe I've become more prone to listening out for flaws than i did 3 years ago!
So yes, the static noise is there, and if I am revising and want peace and quiet, I have to turn off my system (by the control pad) so that it is quiet - if not my ears pick up the static and it annoys me after a while.

-As for the interference, I would have said it was interference, if there was somethin here that would interfere with it. The speakers, PC, and everything is at least 1-2m away from the sub. thus there really shouldn't be anything interfering with it.

I have also tried unplugging the socket, and putting it DIRECTLY into the wall, thus eliminating any "extended power socket" problems.
I'll try and get hold of another power lead, as they are pretty much universal, and see how that goes.

I do agree on tom's hardware thing that "inexpensive systems have this problem" - that doesn't surprise me to be honest, and relatively speaking the Z-5500 is a cheap system, but boy o boy do I love it.
Might look into getting a full blown system soon, but I don't think many offer the same functionalities, and conveniences as my Logitech does: ie. 505watts, 5.1, optical and analogue connections, easy switching between connections, and dolby surround sound.
post #6 of 21

Yeah, all of this is very normal for speaker systems like yours and mine.  They're just not made for audiophiles.  Most people wouldn't notice these things at all, but we do.

 

So, I say stop trying to figure out how to fix it and just mentally tune it out.  I mean, there's nothing to fix.

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post #7 of 21
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

Yeah, all of this is very normal for speaker systems like yours and mine.  They're just not made for audiophiles.  Most people wouldn't notice these things at all, but we do.

So, I say stop trying to figure out how to fix it and just mentally tune it out.  I mean, there's nothing to fix.

Well that's the thing - I was wondering if there would be.
I'll do some more testing, but appreciate the help nevertheless!

Just getting your feedback, with your system reassures me smile.gif!

Oh yes there is a fix...but the bank manager won't like that "fix" hehe
post #8 of 21

I think you're going to drive yourself nuts if you keep this up.  Seriously.  I mean, not only do you need to have your ear right up against the subwoofer in order to hear this hum, but the room has to be silent in order to hear the static hiss.  If this were a system geared towards audiophiles, then I think I'd be a little bit concerned, but this is a Logitech speaker system we're talkin' about here.

 

By the way, you're lucky:  I can hear my hum while just sitting here in my chair.  I have to pay close attention, but I can hear it.  If I'm not paying attention, then I don't hear it.

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post #9 of 21
Check the source cables running from the speakers to whatever device theyre attached to. If this cable is very long, it is almost certainly getting electromagnetic interference from other electrical currents in the room, so perhaps try a shorter cable if it is replaceable. I get humming on any of my speakers if I use a cable longer than about 10ft, and my 50ft cable buzzes like a chainsaw. Its a sad side-effect of useful physics.

Its the same reason power lines run high voltage/low amperage. Current in a wire creates an EM field that really messes with nearby electrical devices (depending on their orientation)
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post #10 of 21
My Z-5500's have this problem, I just assumed it was normal, other than that they work perfectly fine, I wouldn't worry about it, they aren't audiophile quality but they do a good job of annoying the neighbours. thumb.gif
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