Using All Pass Filters to Improve Directivity Response

By Charlie Hughes In this article, Charlie will how all pass…

Think Digitally

By Steve Macatee Welcome to a recurring column on many things…

Common Loudspeaker Format (CLF) News

By Pat Brown An update on Common Loudspeaker Format (CLF) . The…

Fixing the Drywall Box

A low budget solution to a common acoustical problem Theory and…

"In Situ" Absorption Coefficients – Part 2

The best data comes from actual measurements. The acoustical absorption of a surface can be measured “in situ” with almost any measurement system. Here is a method and some caveats.

Sound Sources for RT Measurements

What's the best way to measure reverb times? Balloon pops? Omni loudspeakers? This article compares multiple source types and presents some surprising conclusions that can greatly simplify the RT collection process.

Human Processing of Reflected Sound

This is another perspective on the significance of reverberation time and early-decay time, and the relationship between the two.

Constant-Beamwidth Transducer (CBT) Arrays

Don Keele, Jr. is at it again. His CBT line array has interesting and useful radiation properties. This introduction to the technology with get you thinking about possible applications.

Lakewood Church Revisted

Lakewood Church is the largest house of worship in the US. The Heard's own Russ Berger was instrumental in its transformation from a basketball arena to an auditorium. These room impulse responses allow you to listen to the space, analyze the data, and take a virtual visit to one of the best-behaved arena-sized spaces in the world.

Origins of Preferred Numbers

Don shows how to calculate the ISO fractional octave center frequencies.