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| Humming in speakers |
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| electricd:
I do have a 22W blacklight hanging above the speakers. I have sheilded speakers, but regular speaker wire. How do you go about sheilding the speaker cable (I have never heard of dong this?). I really hope the ground loop isolator works, as it would be MUCH easier to accomplish. Thanks! ED7 |
| Chris:
Does the hum go away if you turn off the blacklight? --Chris |
| Chris:
--- Quote from: rampy on October 02, 2002, 08:31:46 am --- you dirty rat! ;D yeah that was me... I had been watching the broken one and the more complete one as they were like 9 bucks and 15 bucks going into the last day... I was totally blown out of the water on the complete one (I tried to bid 20 something and it said sorry minimum bid 46.06 or something) Did you actually end up with it, or is that someone else that got it at the last minute. I'm not sure if I regret not bidding more or not, though... but not sure what good half a SW yoke would do me... rampy --- End quote --- No, someone beat us both by a few cents. I was at rehearsal when it ended, though... |
| hyiu:
up to my very limited knowledge.... if a speaker has those "weee"ing / "hummm"ing noise..... especially in car audio.... if you turn it on and have no music... it'll have those "weee"ing noise... and the harder you step on the gas (the engine runs faster), the louder (higher pitch) that "weeee"ing noise is.... if I'm not wrong... (cannot guarantee... heard from some electrican some time ago...) its mainly caused by some kind of feedback to the amplifier.... (not really the speaker...) but how to take care of that.... sorry... donno.... but that gound loop isolation solutions sounds like a reasonable approach to solve this.... you ground loop the amp ?!?! |
| BobA:
There is a bit more useful info that might be helpful in this troubleshooting exercise. 1. What is used to power your amp kit. Is it regulated DC? and if so from what source. Does the amp hum with no input? Does it hum with the light turned off? 2. What is the level of the signal you are feeding the amp? Can it be increased by increasing the volume of your PC? A higher level signal is more able to overcome noise. 3. Are all your grounds connected? What are you using to connect the PC to the amp? Is this wire sheilded or at least twisted? This is a low level signal and could be picking up noise. 4. You can get sheilded audio cable. Most of it for speakers is quite expensive. It is more likely that your amp is picking up noise and amplifying it then the speaker wires picking up the noise where the signal is at higher levels. BobA |
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