PC Speakers

[Andy!]

On my Computer I have 2 small speakers and a bass speaker. Latley since I have moved them, then do a small pooping noise every now and then, does anyone know what this is? The speakers are all apart from each other. I do have alot of 13amp extensions near the bass speaker. Also I have a taxi comany across the road what that effect it?

Thanks Guys,

[the kid]

I sometimes get a problem with my phone doing things with the speakers don't know why. May be that

[Andy!]

Yeah I always do have a popping sound when I get a cool on my mobile or a teat message etc. But even when I dont it still does the sound.

[Jivemaster]

Mobiles do "touch base" regularly so that the cell knows where to find them should a call occur. this does cause interference, not certainly yours tho.

[Matt]

seeing as you have a lot of mains cables around your bass speaker, (assuming this bass speaker had the main amplifier for the other speakers in), this could be your problem.

 

when appliances such as fridges and televisions turn on, they emit certian blasts of high frequency interfearence down the mains line. some amps/speakers interpret this as a pop or a click, your pc power supply could also be doing this as most computer power supplies are switching 400/500 times a second, but they usually have a filter to stop them affecting other components.

 

This pop/click you are hearing could also be a relatively small, (but large enough to effect the speakers), static build up in the earth line, this can be caused by lots of things, to many for me to list here anyway, but that would also imply you have something wrong with your equipotential bonding on the earth, (where all your earth lines are connected to each other in your house, you would have to get an electrician to come and test this if it were)

 

the point of mobilles near the speakers is also very valid in this case, but in my experience it has been more of a tuneful sound rather than a pop or click, and the reason why it does it when your not getting a call or message is because the mobile is always sending out signals to your service provider signalling the phone is turned on, and what "cell" it is in.

 

hope this info sheds some light on your problem.

 

Matt

[Ike]

This pop/click you are hearing could also be a relatively small, (but large enough to effect the speakers), static build up in the earth line, this can be caused by lots of things, to many for me to list here anyway, but that would also imply you have something wrong with your equipotential bonding on the earth, (where all your earth lines are connected to each other in your house, you would have to get an electrician to come and test this if it were)

I'm not sure I understand you point here. If it was a faulty cpc you would get more than static build up, the PC itself will probably leak a miliamp or two to earth via the cpc. In order to get a static build up in the mega volts (?) to earth the cpc would have to be realy crap ie high impeadance, even a highly capacitive earth could not block this kind of DC and still let a fault or leakage current at 50Hz 230V rms pass.

 

Even if there was a build up of charge on the cpc I can't see how this would cause poblems as most PC speakers are either SELV or double insulated with no conection to earth. AFAIK most sound cards have there outputs isolated from earth, mine certainly does and is a very cheap and nasty one.

 

I think one of your other points are likely to be the cause.

 

In a normal domestic situation there are lots of things likely to cause high frquency spikes such as thermostats on central heating systems, irons and imersion heaters and manual swithcing of cookers and other relativly large loads in terms of domestic instalations.

 

The close proximity of current carrying conductors, mobile phones, taxi company transmitters etc to the unamplified signal comming from your soundcard to your amp and the amp itself may also be the cause.

[Matt]

about the earth, static is in the megavolts but just with an extremely low current (what I was taught in a level physics anyway) but even the smallest bit of static build-up in an amp can cause something to happen, I got a shock of one about an hour ago (yes I am at work) and it did take me by surprise, then sound from the speakers did become a slight more detailed, but I do agree with you, it probably wouldn't make a significant enough difference on the system you are using, in my case it was a £30,000 system

 

Matt.

[Andy!]

Ok thanks alot guys. So I dont have anything mager to worry about then?