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Steven Kaplan
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 Posted: Wed Sep 12, 2007 6:20 pm |
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Quote: Alright this is weird. The whole set was working fine and all quiet and suddenly, when i changed my surge protector to UPS for TV and Amp/Speakers, i hear humming now. Its so annoying. I tried to isolate the cause but didnt help. Any idea?
I'm not supposed to get into tech stuff, but sounds like you are getting 60 cycle ground loop hum. TV is a different ground (You likely have a cable signal coming in). In changing that surge protector or making some modification it sounds as though you have also lifted a ground. The standard electric current or wall current is an earth ground, but cable TV isn't so your getting imbalanced current running all over the place (assuming this is ground loop)..
Wait for Keith or Lonnie on this.. When I plug things in, or push switches I start fires, and explosions.
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aznknightz17
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Posted: Wed Sep 12, 2007 7:51 pm |
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Is it because of the cheap cable i bought from radioshack? The RCA to 1/4".
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Steven Kaplan
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Posted: Wed Sep 12, 2007 8:26 pm |
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Well, I doubt it's your RCA patch cable, my guess is it's either noise from groundloop, or noise from an inexpensive UPS unit but I'm going to let one of the tech people answer this. I'm just not good in this area. Sounds like Ground loop hum
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Lonman
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Posted: Thu Sep 13, 2007 12:26 am |
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aznknightz17 @ Wed Sep 12, 2007 7:51 pm wrote: Is it because of the cheap cable i bought from radioshack? The RCA to 1/4".
Doubtful since you said it only happened when you went from the surge protector to the UPS - sounds like a bad ground in the UPS. If that's the case, go back to the surge protector, don't really need a UPS backup for a karaoke system anyway. _________________ LIKE Lonman on Facebook - Lonman Productions Karaoke & my main site via my profile!
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aznknightz17
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Posted: Thu Sep 13, 2007 4:20 am |
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Lonman @ Thu Sep 13, 2007 3:26 am wrote: aznknightz17 @ Wed Sep 12, 2007 7:51 pm wrote: Is it because of the cheap cable i bought from radioshack? The RCA to 1/4". Doubtful since you said it only happened when you went from the surge protector to the UPS - sounds like a bad ground in the UPS. If that's the case, go back to the surge protector, don't really need a UPS backup for a karaoke system anyway. Its for my TV. I was using all cords on single surge. Then now i split them up. One is for karaoke sys. and the other(UPS) is just TV and lamp.
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mckyj57
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Posted: Thu Sep 13, 2007 6:19 am |
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aznknightz17 @ Thu Sep 13, 2007 7:20 am wrote: Its for my TV. I was using all cords on single surge. Then now i split them up. One is for karaoke sys. and the other(UPS) is just TV and lamp.
Therein lies the problem. Skip the UPS and plug the TV into the same AC circuit as the rest, and I bet your hum goes away.
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karyoker
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Posted: Thu Sep 13, 2007 6:42 am |
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It is best to use something like a Furman power conditioner and plug everything onto the strip. Then you have a common ground with everything.
When you have a ground loop a lightening storm or intermittent power failures and surges will fry sensitive stuff. Lifting the ground on a laptop for example and a big
power surge will totally destroy it.
In older venues teaster like this can be used to check ground integrity.
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Lonman
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Posted: Thu Sep 13, 2007 9:02 am |
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aznknightz17 @ Thu Sep 13, 2007 4:20 am wrote: Lonman @ Thu Sep 13, 2007 3:26 am wrote: aznknightz17 @ Wed Sep 12, 2007 7:51 pm wrote: Is it because of the cheap cable i bought from radioshack? The RCA to 1/4". Doubtful since you said it only happened when you went from the surge protector to the UPS - sounds like a bad ground in the UPS. If that's the case, go back to the surge protector, don't really need a UPS backup for a karaoke system anyway. Its for my TV. I was using all cords on single surge. Then now i split them up. One is for karaoke sys. and the other(UPS) is just TV and lamp. Exactly, drop the UPS & put the tv back on the circuit it was on before the hum started. _________________ LIKE Lonman on Facebook - Lonman Productions Karaoke & my main site via my profile!
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aznknightz17
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Posted: Thu Sep 13, 2007 2:00 pm |
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Oh ok. I will do that. Also, if i get a two pair of the same microphone set, do they interfere with one another?
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Lonman
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Posted: Thu Sep 13, 2007 3:01 pm |
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If they are 2 sets of wireless on the same frequency, then yes you'll get interference from each other.
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aznknightz17
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Posted: Fri Sep 14, 2007 7:50 pm |
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will the humming hurt my speaker in any way if prolong?
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Lonman
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Posted: Sat Sep 15, 2007 10:20 am |
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Not not really, just really irratating to listen to.
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