Downtown
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Jun 27, 2020

Buzz / humm with two L1 and soundcraft ui16

I just purchased two new L1 compact stacks and a Soundcraft ui16 mixer for my intimate coffee shop venue.  If I plug guitar (fender strat) and mike (shure sm58) in the L1 and daisy chain the two L1 stacks together, I get zero humm/buzz. The sound is crystal clear. 

when I plug the soundcraft mains in the line-in on the L1’s, without even plugging in an instrument/mike in the mixer, I get a buzz/humm the instant I increase the mains on the mixer...

 

I tried different electrical outlets, I tried plugging everything in the same outlet with the help of a power bar.  I’ve tried different audio cables.  I am out of ideas?  

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Oldghm
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May 25, 2004

Re: Buzz / humm with two L1 and soundcraft ui16

Hi Downtown,

 

It's not unusual for peripheral equipment to introduce a buzz. It appears you have checked all the usual suspects and not found a solution.

 

Sometimes careful gain staging can diminish the hum to an acceptable level.

 

I assume you are following the suggestions in the Compact user guide. As I write this I do not recall suggested levels but I will look around and link to info if I can find something helpful.

 

O..

 

https://toonz.ca/bose/wiki/index.php?title=L1®_Compact

RemiBertrand
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Nov 17, 2020

Re: Buzz / humm with two L1 and soundcraft ui16

Thanks.  Seems like the trouble was not coming from the L1's.  We tried 3 sets of audio cables and finally, tested another mixer and everything went away.  It was a mix of one faulty cable in part but most of our hum was coming from the mixer itself.  I then tested the mixer with another set of powered speakers a friend lent me and the same buzz appeared...  

 

Thanks so much guys for getting back to help us out 🙂