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Lighting & Electrical
Lighting system causes buzz/hum in the circuit breaker panels
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<blockquote data-quote="David Buckley" data-source="post: 63808" data-attributes="member: 2235"><p>Re: Lighting system causes buzz/hum in the circuit breaker panels</p><p></p><p></p><p></p><p>Standard answer: Although the <em>cause</em> of the noise may be the lights, its not their <em>fault</em>; a correctly configured audio system will reject buzzes and hums from lighting and other external sources, except under a small number of specific circumstances.</p><p></p><p>Question one: Does the entire sound system operate from one socket outlet using entirely its own distribution? If you use multiple sockets to power the system (say one at stage for the amps and another in the house for the desk) then you have multiple grounds, and with that the possibility of electrical noise appearing between the grounds which may break through into audio. The problem is exacerbated in locations where there are multiple panels, and especially when they are incorrectly wired, or perhaps more honestly, wired in a way that hasn't been acceptable for many years.</p><p></p><p>Question two: Is there any electrical connection to the sound system to "something else", such as a metal DI box on a steeldeck stage with a parcan from the lighting boys also on the steeldeck? Or is the Lx desk powered off the sound power distribution?</p><p></p><p>Dimmers often do physically make a racket, and if you get enough of them they can make busbars rattle as well. In RnR you don't normally notice the dimmer racks buzzing over the noise of the PA, but in theatre, dimmers can stick out like a sore thumb.</p></blockquote><p></p>
[QUOTE="David Buckley, post: 63808, member: 2235"] Re: Lighting system causes buzz/hum in the circuit breaker panels Standard answer: Although the [I]cause[/I] of the noise may be the lights, its not their [I]fault[/I]; a correctly configured audio system will reject buzzes and hums from lighting and other external sources, except under a small number of specific circumstances. Question one: Does the entire sound system operate from one socket outlet using entirely its own distribution? If you use multiple sockets to power the system (say one at stage for the amps and another in the house for the desk) then you have multiple grounds, and with that the possibility of electrical noise appearing between the grounds which may break through into audio. The problem is exacerbated in locations where there are multiple panels, and especially when they are incorrectly wired, or perhaps more honestly, wired in a way that hasn't been acceptable for many years. Question two: Is there any electrical connection to the sound system to "something else", such as a metal DI box on a steeldeck stage with a parcan from the lighting boys also on the steeldeck? Or is the Lx desk powered off the sound power distribution? Dimmers often do physically make a racket, and if you get enough of them they can make busbars rattle as well. In RnR you don't normally notice the dimmer racks buzzing over the noise of the PA, but in theatre, dimmers can stick out like a sore thumb. [/QUOTE]
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Lighting system causes buzz/hum in the circuit breaker panels
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