electrician

[Jason Goodyear]

I'm trying to resolve some the nasty electrical buzzes that make the PA at SFX so painfully noisy.

Is anyone on the list an electrician or even ideally an electrician familiar with the construction of the building? I have some questions I'd like to ask.

thx, jason

[Gary Lee Nelson]

Do you use a power conditioner? I have one i could bring offer to see if it would fix the problem.

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[Jon Bringhurst]

Can't really help you with finding an electrician, but from working on stage crew back in high school I can tell you that it's probably a ground loop issue.

If you can, try to find everywhere in the system that's attached to ground and move the ground wire to another ground that's not connected to the ground for everything else (there's probably a difference in potential between grounds and current is flowing from one ground to another). It could be something more subtle, but this checking for a ground loop is the first thing you (or an electrician) should be trying.

-Jon

On Jun 1, 2011, at 3:07 PM, Jason Goodyear wrote:

[Jason Goodyear]

Thanks a lot. It's a long story though that probably goes back to some larger construction issues and would need a multi-part solution. Let me see if anyone else chimes in here and then I might get in touch to see if we can set up a time to check out the conditioner.

jason

[Jason Goodyear]

Thanks, but it's more than just a simple ground. There is the classic 60Hz hum but depending on combination of outlets used also harmonics at 180 and 300. I'm pretty sure using the building's ground at all is out - instead physically grounding or perhaps using an isolation transformer. I want to talk to an electrician because there is the possibility that some elements in the building - like variable speed fans in the ventilation system and battery backups - may also be contributing.

jason

[Gary Lee Nelson]

I use the conditioner in my own studio and it seems to fix everything. I plug it into the wall and plug everything else into it. It's a Furman Merit Series - a small one.

[Jason Goodyear]

Furman makes great stuff.

[Marcos]

On Wed, Jun 1, 2011 at 3:07 PM, Jason Goodyear <ja...@mediaslinger.com> wrote:

I'm trying to resolve some the nasty electrical buzzes that make the PA at SFX so painfully noisy.

All cases I've seen are issues where the volume is down too far at the source which is then getting over-amplified by the PA, creating a high noise-to-signal ratio.  

mark

[David Collins]

During my radio days, prior to setting up remote broadcasts we routinely tested and sorted cables  to get rid of those with bad connectors, or less often, a short between the wires in the cable.

David

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