Very High Pitched Noise!

  • Thread starter Thread starter Farno
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Farno

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When plugging in my third monitor, I get this extremely high pitched noise. I've brought it down to the third monitor which runs on a USB to VGA converter. Whenever I unplug the power to the monitor it goes away. I plugged the power cable into a different circuit outside the room and the hissing is gone (extremely feint).

One thing about the hissing is that the volume on my HS80's doesn't effect the sound of the noise. Right now I have an extension cord running to a different room. Does this sound like a ground loop problem? What product will get rid of this noise?

Thanks!
 
Ok... no responses. This noise is extremely high pitched. Like one of those sound bomb things from an ipod. It kills my ears so I haven't been using my monitor due to this noise. When using my cheap alesis monitors, I don't get this sound unless they are turned way up.
 
How old are you? What frequency is the noise pitched at? I can't hear anything above 15 kHz, myself.
 
Farno said:
Ok... no responses. This noise is extremely high pitched. Like one of those sound bomb things from an ipod. It kills my ears so I haven't been using my monitor due to this noise. When using my cheap alesis monitors, I don't get this sound unless they are turned way up.
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Does it happen all the time or at night? The reason I ask is we had a similar problem at a hall because of halogen lights on the same circuit as our amps. The lights would turn on by a timer at night and we'd get instant static and hiss.
You may have a similar problem with something else(like an air conditioner, the fridge or lighting) using the same circuit since moving your source changed things.
Make sure you are not running power lines paralell to your speaker, mic or instrument cords. It could be just an unshielded or bad cord you are using. swap things out one at a time until you find the culprit. If necessary get an electrician to check it out for you.
 
Doesn't sound like an earth loop - these tend to be at the frequency of the mains i.e 120hz in your case. More likely placement of a mains transformer near speaker cables or RF interference from somewhere like lighting circuits etc. If as you have said you have eliminated the problem by using a different supply, then work backwards and isolate all the other appliances until you find it.
Good luck
 
Ok did a little more testing. I don't know if this will help at all but when unplugging the 1/4 cable that goes to the speaker the noise goes away. If I touch the cable plug, there is no high pitched noise. Now if I touch cable plug while touching the firebox, I get that high pitched noise. So I guess it's the firebox, and a ground issue.

I could get a power condition (which is probably a good idea and don't have a problem doing) and it probably would remove the noise.

I do plan on getting a firestudio and selling my firebox... though this probably won't fix the problem. I could always see and then get the conditioner. Another thing is using an XLR input to the speakers. They do have a XLR in. I believe the firestudio doesn't have an XLR out but I could go 1/4 to XLR with a cable. Maybe XLR will fix the problem (probably not).

So I guess if all else fails, the power conditioner is the way to go.
 
A 1/4 (or TRS) and the XLR are both balanced connections (in and sleeve to ground, pin 2 and tip to signal hot, and pin3 and ring to signal cold) and the input on your monitors may be in parallel so your probably right that it wouldn't make a difference, unless the 1/4 connection your using is unbalanced and its picking some EMI up. I would probably still give it a try anyways.
 
Unbalanced speaker cables have caused that for me. TRS stopped the noise.
 
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