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2010 NFPA 72

By John Murray. If anyone has a chart or formula for adding a higher noise level to STI results measured at a lower noise level, I would be most interested in using it
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Reliable Computing

By Ray Rayburn Reliable Computing - Ray Rayburn shares some valuable…
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What's in a word?

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By Ray Rayburn Sincere
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Is it always meaningful to talk about T60?

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by Ray Rayburn In this article, Ray Rayburn helps us understand…
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Manifold Drivers - How Much Additional SPL is Realized.

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Two drivers can be manifolded onto a single horn to achieve increased acoustic output. But "how much "is not as straightforward as one might think.
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Polarity 101 - Some subtleties regarding device polarity

Since most sound reinforcement equipment uses bipolar power supplies (allowing the audio signal to swing positive and negative about a “zero” reference point), it is possible for signals to become inverted in polarity (flipped over).
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Understanding Horn Directivity Control

Pattern control is essential in sound reinforcement systems. The beamwidth of a horn is determined by some key size/wavelength relationships. Charlie provides a short history and an overview of the math.