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  #1  
Old 01-14-2010, 02:26 PM
geoff geoff is offline
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Location: hamilton, ontario
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UREI 1620 LE Issue

My mixer is humming as if it needs grounding. all things are grounded which should be. it even hums through the headphone jack when the volume is up past 3. any help with this issue would be hot. thanks.
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  #2  
Old 01-14-2010, 02:28 PM
clubman5 clubman5 is offline
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Check your TT and CD input cables. If you have a cable, especially a TT with a lifted ground, that would do it.

Check all your cables to make sure none of your connections have an open ground lead.
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  #3  
Old 01-14-2010, 02:45 PM
geoff geoff is offline
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thanks. i will check that when i get home. any other possible scenarios? could it be internal?
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  #4  
Old 01-14-2010, 03:04 PM
vinyl_junkie vinyl_junkie is offline
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Ground Loop?

Are you plugging a computer into the mixer?
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  #5  
Old 01-14-2010, 03:05 PM
clubman5 clubman5 is offline
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OK, if it sounds like loud humming, ( 60hz buzz ) then yes it can be internal, possibly a power supply decoupling capacitor has gone bad and opened up, or, if you travel around with the unit it may be possible the unit got jarred enough to dislodge a cap lead. If this were the case, you would hear a LOUD BZZZZZZZZ through your setup at all times.

At this point, you would need to have the unit serviced, and checked out. But, more than likely, I would check all my connections first.
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  #6  
Old 01-14-2010, 03:11 PM
geoff geoff is offline
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i have my tv connected to the mixer, but no pc.

by LOUD BUZZZZZZ do you mean it will drown out other sounds? - the buzz is not louder than the music at high or low vols - just when there is nothing playing i can hear a bzzzzz if the house is not silenced. its connected to an Adcom GFA 545 II amp. im thinking it might be the tv connection. should be home in 45 and im going to check it then. thanks guys for your input.
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  #7  
Old 01-14-2010, 03:13 PM
vinyl_junkie vinyl_junkie is offline
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Try disconnecting the TV from the mixer and also unplugging the TV from the wall
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  #8  
Old 01-14-2010, 03:14 PM
clubman5 clubman5 is offline
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Quote:
Originally Posted by geoff
i have my tv connected to the mixer, but no pc.

by LOUD BUZZZZZZ do you mean it will drown out other sounds? - the buzz is not louder than the music at high or low vols - just when there is nothing playing i can hear a bzzzzz if the house is not silenced. its connected to an Adcom GFA 545 II amp. im thinking it might be the tv connection. should be home in 45 and im going to check it then. thanks guys for your input.
BINGO!

TV will do it ALL THE TIME!

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  #9  
Old 01-14-2010, 04:10 PM
eoin eoin is offline
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I had the same issue with my serato box picking up interference from my laptop. Just put a bit of distance between the 2 and it was sorted.

I'd definitely try to disconnect the TV. I'd be very surprised if that wasn't the cause.
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  #10  
Old 01-14-2010, 04:21 PM
clubman5 clubman5 is offline
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Quote:
Originally Posted by eoin
I had the same issue with my serato box picking up interference from my laptop. Just put a bit of distance between the 2 and it was sorted.

I'd definitely try to disconnect the TV. I'd be very surprised if that wasn't the cause.
YEAH, and not only that! With computer setups, a problem all the way at the input of an amp, will back feed to the Serato interface, and/or laptop, too! It is sensitive. And be careful to keep the interface and audio cables away and/or off of AC power cords.

I know guys who say they get interference and RFI if the cables are too close to, or running alongside the cable TV line. I bet Geoff disconnects that TV from the Urei, and the noise goes away.
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  #11  
Old 01-14-2010, 05:32 PM
geoff geoff is offline
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wow. you hit it on the head scott! "audio cables away and/or off of AC power cords" ....it was my rca's running from the isolator - they were resting on the power supply. lift them off and ..... SILENCE!!! thanks again all of you for your help.
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