Re: ground loop hell

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On 02/11/2015 02:06 PM, Fons Adriaensen wrote:
> That [stage amplifier] isolation is worth having, always. In modern
> PA systems it's done by using optical fibre snakes. If ever you
> consider replacing your current gear that would be a good option.

On 02/12/2015 12:53 PM, Len Ovens wrote:
I will order the boxes (I think 6 lines worth will cover anything
possible with the mixer we have). I was going to put in a network cable
anyway (if we use it right now or not) but could aslo put in optic
line(s). Are they subject to degradation with time if not in use? It is
not a long run at less than 100ft (this includes running it up above the
ceiling and dodging open rooms etc. The dx from stage to mix is less
than 50ft.)

I assume you mean 6 additional digital channels over one Ethernet cable to supplement your existing snake (?).


I suspect that migrating to digital piece-by-piece could be a painful and expensive experience if you don't know your exact final configuration before starting. It's a complex and highly technical field. The product lines have short life cycles. Compatibility is tough. Maximum cable distances are surprisingly short (but should be enough for a small venue). Copper networking equipment is also subject to ground loops (fiber should not be). Specialized tools and equipment are required for installation, maintenance, and trouble-shooting. And, very few people are going to be on top of the learning curve.


For the small venue that you've described, I'd recommend a balanced analog system throughout, with converters located at unbalanced gear as necessary.


But if you're going to pull Ethernet cable, understand that cable is cheap (1,000 ft. box of Category 5e riser cable is $50~100). It's the labor and/or raceways, enclosures, and, especially, equipment that add up quickly. Make sure you understand the RFI/EMI interference issues and prevention measures. (Similar comments apply for analog audio.)


David

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