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Post by alhull on Jun 8, 2017 12:54:34 GMT -5
My bedroom setup: Emotiva UPA-500, UMC-200
Lately when I power on my UMC-200 which triggers the UPA-500 amp, I've been getting severe static/crackling out of the left front channel. If I turn off the UMC-200 manually keeping the amp on, the static continues, so I know it's not coming from the pre-pro.
After about 15 minutes of this nearly intolerable noise, it suddenly quit. After about an hour it came back again.
Nothing has changed, no equipment has been touched or moved. What could cause this loud static crackling noise? Is my amp going bad?
I use this setup every single day for years now. Help!
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Post by garbulky on Jun 8, 2017 13:06:46 GMT -5
Change the RCA cable. See if the static follows it?
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Post by Axis on Jun 8, 2017 13:48:52 GMT -5
My bedroom setup: Emotiva UPA-500, UMC-200 Lately when I power on my UMC-200 which triggers the UPA-500 amp, I've been getting severe static/crackling out of the left front channel. If I turn off the UMC-200 manually keeping the amp on, the static continues, so I know it's not coming from the pre-pro. After about 15 minutes of this nearly intolerable noise, it suddenly quit. After about an hour it came back again. Nothing has changed, no equipment has been touched or moved. What could cause this loud static crackling noise? Is my amp going bad? I use this setup every single day for years now. Help! "What could cause this loud static crackling noise?" That's a good question and why are you pointing toward the amp is another. Your not new to this and a bad connection is the first thing you check for this unless you are pushing said amp to clipping. Does not sound like your were but most know if they are, clipping an amp will give a crackle sound. It's loud when it does and the sound is up because you are pushing it. An amp that is going bad does not crackle in my experience but the sound dies. Bad connections make a crackle sound but at any volume and the first place you look for a crackle sound. Change this Thread name if it is not a Bad 'static' sound on your UPA-500 because there are no reasons to blame the UPA-500 unless it is true. |
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Post by Axis on Jun 8, 2017 13:53:20 GMT -5
Would your profile picture like to have a beer with me ?  |
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KeithL
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Post by KeithL on Jun 8, 2017 14:11:07 GMT -5
There are some types of faults that will cause the amplifier itself to produce a "static crackling" noise.
It's easy enough to find out for sure.
Try disconnecting EVERYTHING EXCEPT THE SPEAKERS from the amp and see what happens.
If it still crackles with nothing connected, then it probably has a transistor which has failed in the input stage, and it will need to come in for service.
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Post by Axis on Jun 8, 2017 14:18:52 GMT -5
There are some types of faults that will cause the amplifier itself to produce a "static crackling" noise. It's easy enough to find out for sure. Try disconnecting EVERYTHING EXCEPT THE SPEAKERS from the amp and see what happens. If it still crackles with nothing connected, then it probably has a transistor which has failed in the input stage, and it will need to come in for service. Thanks Keith for stepping in here. You would know that if a transistor failed in your amps that this may happen. Not me ! Bad connection is all I know that does this. Learn something everyday.  |
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Post by Axis on Jun 8, 2017 15:12:53 GMT -5
Would your profile picture like to have a beer with me ? Mountain gets this, |
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Post by monkumonku on Jun 8, 2017 15:16:45 GMT -5
Would your profile picture like to have a beer with me ? Why thank you! Most people get scared off. |
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Post by Axis on Jun 8, 2017 15:20:41 GMT -5
Would your profile picture like to have a beer with me ? Why thank you! Most people get scared off. I already confessed that this Woman hurt me but like every man on the planet that has a pulse, will do it anyway. |
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Post by alhull on Feb 26, 2018 13:39:56 GMT -5
Would your profile picture like to have a beer with me ? Sure, if you're into 6 inch high ceramic women... |
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Post by Soup on Feb 26, 2018 19:34:00 GMT -5
Send it in for service if under warranty.
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Post by mountain on Feb 26, 2018 20:18:33 GMT -5
The six inch ceramic woman?
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Post by leonski on Feb 26, 2018 21:01:00 GMT -5
One test applied by techs would be to spritz each transistor with a tiny squirt of liquid freon. It's COLD and a bad transistor will show itself as will a bad solder.
DO NOT DO THIS without requisite skillset. Amp is ON when doing this and those largeish caps can hold quite a charge.
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