View Full Version : speaker making humm?
ESPplayer7
07-29-2005, 12:35 AM
My speakers are making a constant buzzing humm whenever i turn the volume up a little bit, does this mean time for new speakers or did i do something that i can fix?
PrntRhd
07-29-2005, 12:45 AM
Check that the jack is completely inserted. Also I moved this to Multimedia
Sylvander
07-29-2005, 04:37 AM
NOISE = sound you don't like, because it's useless.
SOUND = the stuff you do like.
In a good amplification system the sound/noise ratio should be high.
The sound should be 65 Decibels greater than the noise.
So this is all about relative loudness levels.
A. If you turn your volume control to a position where the sound is at just the right loudness level, how loud is the noise [hum/buzz in this case]?
Ideally the noise should not be perceived [may be there, but so quiet it isn't normally noticed].
If it is intrusive, then it is unacceptable.
Does this happen no matter what the signal source?
i.e. Is this a characteristic of the amplifier/speaker hardware?
Or a problem with the signal source?
Would perfect speaker/amplifier hardware sound just as bad?
B. If you unplug the jack and touch the centre pin of the jack with your finger how loud is the hum/buzz with the volume control at normal level?
How do the two hum levels [A & B] compare?
Fruss Tray Ted
07-29-2005, 09:11 AM
There's a myriad of reasons for hums and noises coming through your amplified speakers. What you can do to lower or eliminate the problem depends upon how your's is setup.
If your setup is just an internal soundcard and you use line/speaker out to a set of powered speakers:
1:
Make sure the Volume Control's sliders in Windows are beyond halfway up when in use. This will allow you to keep the volume on the speakers down to a level where the signal to noise ratio is acceptable. If you have the volume on the speakers high and the Windows volume low, you are amplifying a soft signal that in most cases has the signal/noise ratio at something less than 65:1 (more like possibly 24:1 for example). After all, there is some noise there at all times and if you amplify it, your gonna hear it. So working the volume controls to your advantage helps. You want a strong input signal to make the s/n ratio a wide margin.
2:
The amplifier in your speakers or the souncard in your pc may be being affected by an outside source such as a tv, the motor windings of a cassette deck, and other sources of RF interference. Try relocating various things to see if the hum goes away or changes in tone.
3:
Your ac that is powering your speakers may need polarity reversed or the ground lifted to stop the hum esp if they are powered through a different circuit than your pc. If they use a 2 prong plug, you may be able to turn it around and the noise goes away. If it uses a 3 prong plug you may try a grounding adapter on the plug to 'lift' the ground pin (the round one) up and out of the socket. This may help but if not, then you can turn that around as well and try it.
4:
If you run the wire that goes from your soundcard to your speakers next to or near an unshielded wire or appliance (monitors included) you may get a hum through that as well. Again, try moving stuff around.
_____________________________
The input to your powered speakers wants to amplify any signal it finds. This includes any RF (radio frequency from monitors etc) and line noise (60hz in USA, 50hz in GB for examples from ac cords and appliances), among others. But of course, quality of the brand of speakers can make a difference also. Cheaply made amplifiers without good filtration (capacitors and coils in the circuits) can also be the root of the cause. In such a case, you would be advised just to buy a different/better set of speakers.
FWIW, hope this helps.
ESPplayer7
07-30-2005, 04:54 AM
wow talk about dumb, i just fully plugged in the 1/8 to my sound card, need to check more before i post sorry
PrntRhd
07-30-2005, 09:33 AM
Thanks for posting back with the results. Not that it has ever happened to me too........
:rolleyes: :D
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