The Analog Impedance Meter - Tools of the Trade

By Pat Brown This article gives an overview of the TOA ZM-104…

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

TetraMic™ - Sights and Sounds of Commonwealth Stadium

A mic array allows the realism of a college football rivalry to be captured

Reliable Computing

By Ray Rayburn Reliable Computing - Ray Rayburn shares some valuable…

What's in a word?

By Ray Rayburn Sincere

Is it always meaningful to talk about T60?

by Ray Rayburn In this article, Ray Rayburn helps us understand…

Low-Frequency Loudspeakers Cancellation - Black Hole Sum

By Dale Shirk At the Loudspeaker Arrays Workshop, Kurt Graffy…

Manifold Drivers - How Much Additional SPL is Realized.

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.

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).

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.