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jshoenfelt

XLR Noise

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I am testing a Helix in my church and noticed a fair amount of noise in the xlr output.  I am running the Helix on a UPS and I am not sure if this could be the cause.  I am also told that if there is phantom power present, it could be the cause also.  Any other ideas?  Thanks.

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I have seen a few topics on this, and most have usually turned out to have phantom power somewhere along the signal chain.  Either at the Helix, Mixing Board, PA-Interface, other audio interfaces etc.

 

If I were having this problem, this would be the first thing I would try, and track down.

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Yep. Make sure whatever you have Helix's XLR outputs plugged into has phantom power turned off.

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I just got my Helix last week and I can confirm that phantom power on with anything connecting to the left XLR will cause excessive noise.  Same thing happened to me when I first plugged in.  However, when I was troubleshooting, phantom power didn't seem to affect the right XLR.  

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From what I've read in other posts related to this, everything can be set as it's supposed to be and there's still noise for whatever reason. The work-around is taking the 1/4" outs into a DI box and then going into the board.

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Yep!  Been here - done it!  My church sound man and I went nuts trying to figure it out.  So here ya go.  In Global, set whatever line out you are using to send your signal to FOH to "mic".  AND most definitely turn off phantom power in the Helix.  If you've still got noise then I guess pray.  But only as a last resort of course (grin).

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Happened at my church as well. Was working fine for a practice & a service, then halfway through the next practice, the sound guy turned on phantom power while troubleshooting some piano mic noise, and it was awful. At the time, I unplugged the Helix and went back to a real amp.

 

I haven't played again with the Helix at church because I've been mainly playing bass lately, but when I go back to guitar I'll definitely insist on them turning off phantom power on my inputs. It was dead silent before that.

 

...and I'll still carry around a DI in my Helix bag just in case... but really there's no excuse to NEED to have phantom power on in any modern console.

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From what I've read in other posts related to this, everything can be set as it's supposed to be and there's still noise for whatever reason. The work-around is taking the 1/4" outs into a DI box and then going into the board.

 

The XLR noise issue was going on last night at the first show I've used the Helix.  What we found was the far electrical duplex was no bueno.  So, since we are now predominately an all modeling equipment group of musicians, we ran a single electrical line to the stage and viola ... muy bueno!

 

Yep!  Been here - done it!  My church sound man and I went nuts trying to figure it out.  So here ya go.  In Global, set whatever line out you are using to send your signal to FOH to "mic".  AND most definitely turn off phantom power in the Helix.  If you've still got noise then I guess pray.  But only as a last resort of course (grin).

 

My church has a special panel for musical equipment.  This Easter I will find out if it does the same thing as running all the equipment from one plug, so to speak.

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I am another church guitar player with noisy Helix XLR woes.  For me at least, this is not a phantom power issue.  My church uses a Midas Verona 560 pro board with individual phantom power switches on each channel.  Phantom power is turned off for me, yet I still get loud hiss with the Helix XLR outputs.  On the very off-chance the board is sending phantom power even though it says it isn't, I went ahead and bought one of the phantom power blockers mentioned in earlier XLR hiss threads on this forum (Sescom SES-IL-PPB XLR).  I still get loud hiss even with the blocker in place.  To recap my findings:

 

Hiss even with XLR phantom power blocker installed

Hiss regardless of Line or Mic level output

Hiss regardless of ground lift setting on the Helix

Hiss even when volume is turned all the way down, simply having the Helix on creates noise

 

My only recourse so far has been to abandon XLR and use a DI box with the 1/4" outs.  Something ain't right about this Helix.

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I am another church guitar player with noisy Helix XLR woes.  For me at least, this is not a phantom power issue.  My church uses a Midas Verona 560 pro board with individual phantom power switches on each channel.  Phantom power is turned off for me, yet I still get loud hiss with the Helix XLR outputs.  On the very off-chance the board is sending phantom power even though it says it isn't, I went ahead and bought one of the phantom power blockers mentioned in earlier XLR hiss threads on this forum (Sescom SES-IL-PPB XLR).  I still get loud hiss even with the blocker in place.  To recap my findings:

 

Hiss even with XLR phantom power blocker installed

Hiss regardless of Line or Mic level output

Hiss even when volume is turned all the way down, simply having the Helix on creates noise

 

My only recourse so far has been to abandon XLR and use a DI box with the 1/4" outs.  Something ain't right about this Helix.

 

Did you try multiple channels on the board, and/or have you tried it with any other mixers? Been using my Helix at church for quite a while now with the XLR out and haven't had any issues.

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Did you try multiple channels on the board, and/or have you tried it with any other mixers? Been using my Helix at church for quite a while now with the XLR out and haven't had any issues.

 

I have not used other channels, just the one labeled for electric guitar.  That's something I can probably work with the sound man to test out between our six services on Easter weekend.  As for other mixers, no.  There's just the one. 

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Have you tried to transformer isolate the xlrs? Like what an ART DTI does.

In my rehearsals I get a nasty noise. ART DTI solved it. Ground loop. I don't think phantom blockers isolate the signal / ground.

 

Bonus: the ART also blocks phantom.

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Have you tried to transformer isolate the xlrs? Like what an ART DTI does.

In my rehearsals I get a nasty noise. ART DTI solved it. Ground loop. I don't think phantom blockers isolate the signal / ground.

 

Bonus: the ART also blocks phantom.

 

I'm no expert on this stuff by any means, but after reading a number of posts about the XLR issues folks are having I decided to mess around with my Helix/Gemini 2 setup, which is using the XLR outs, and found grounding has a LOT to do with noise or no noise....simply hitting the ground lift button on the Helix created all kinds of noise, off it was dead silent.  Have some known grounding issues in our house that I've got around with various methods with other gear over the years.  Reversed some of those to see what would happen with the Helix and presto, noise...put them back in place, no noise.  Wondering if it's not so much the XLR's but rather grounding issues folks are experiencing?  Sure looks like that in my simple setup.  Food for thought at least....good luck everyone.    

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It was definately a phantom power issue, and apparently the output is much higher than my HD500, nice and quiet now.  Thanks everyone for your help.

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