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Author Topic: Noise being induced from Phantom power in Whirlwind W3 connectors- anyone experience this?  (Read 1601 times)

Ziggy

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I work at the San Francisco Opera, which runs in the War Memorial Auditorium in San Francisco.  We're getting noise in our microphone lines that we cannot determine how to fix.  

We're hearing snap-crackle-pop noise being induced in our unterminated microphone lines running phantom power.  We’ve traced this problem to the Whirlwind connector itself.  Whenever light pressure is placed on the female (socket) side of the unterminated W3 connector, the snap-crackle-pop noise gets extremely loud.  We were able to duplicate this through a variety of W3 connectors in our system, but not on their latest W3 that we just received last week from Clark wire & cable.  

Does anyone know of the various types of W3 connectors whirlwind has made?  There are subtle physical differences between them.  More importantly, all of the older ones are noisy and the newer ones are quiet.  

Has anyone else had experience with this?  

Please note- this problem is only noticeable in unterminated lines.  Terminated these lines with a microphone or disconnecting the Phantom power makes this problem go away.  However, our level of show is so high that we cannot allow any circuit that tests below our specifications into service.  

Thanks for any assistance with this.  

-Ziggy Tomcich
San Francisco Opera
Sound Department
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Geri O'Neil

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First, everyone's level of show should be this high. Mine is, but unfortunately, this isn't always the case with some folks.

Second, I'm not familiar with the nature of that connector. But the immediate and temporary solution would be to unpatch any un-used channels from the console until you find a permanent solution.

It soulds like your console has globally-switched phantom power, or in groups of 4 or 8? Oooh, iick.

Good luck,

Geri O
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Dave Miller

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You might find this old thread helpful (OK it's about W4s, not W3s).

http://www.live-audio.com/messages/archive6/55872.html

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Ziggy

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Actually we have an Euphonix CS2000 digitally controlled analog mastering console.  Each channel has two individually assignable preamps with seperate phantom power switching for each pre.  

I agree with you that everyone should have a high level of show.  But a high level of show is strongly relative depending on the event.  We're treating this upcoming event as if it were presidential.  We're putting in weeks of labor testing every line impedence, developing contingencies for every possible scenerio.  This isn't just an ordinary show where we test our lines with for continuity.  

The noise induced in our system is only a result of running powered and unterminated mic lines.  The noise goes away when a microphone is plugged in.  However the fact that there is noise in the lines to begin with to us represents the tip of the iceburg- so to speak.  

We're curious why the older W3's are giving us any problems at all.  If the system is setup propperly, there should be no noise whatsoever in any of the channels regardless wheather or not phantom power is running through it or its neighborring channel.  

Thanks for your post though.  
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Brad Irving

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Almost sounds like there are some Cold Solider Joints in the connector.
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Dave Stevens

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Ziggy wrote on Sun, 07 August 2005 23:38

Has anyone else had experience with this?


SF Opera, what a cool gig...

I've had that problem on a couple of Mass series assemblies.  Specifically the unterminated issue either with or without phantom power provided.  At one particular venue there was a consistant clocking noise that not only the local snaking system picked up, but also a couple of touring systems of the same config.  At one point Whirlwind suspected the proximenty of the pins in the enclosure and the moisture at this particular venue as the culprit, though there were other issues at other venues.

What solved it for us was switching to Ramlatch type connectors for those apps.

Dave
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