audioXpress October 2023 Speaker Builder Issue Is Now Available!

In the October 2023 issue of audioXpress, Jan Didden visits Dutch & Dutch, Reinhold Lutz shares a practical way to measure loudspeakers in any room with his AudioChiemgau Mode-Compensator, which is tested by Rens Tellers. We have two DIY open baffle projects from Perry Marshall and Charlie Laub, Richard Honeycutt writes about the Western Electric 91E, and Ethan Winer shares his Popping P Filter circuit. In the Sound Control column, Honeycutt explores Passive Variable Acoustics, and Chuck Hansen concludes his article series on Power Transformers. audioXpress October 2023 is now available in print, digital, and online.

There's a lot of everything in audioXpress October 2022. Starting with a market update on audio for Residential Integration. Next, Jonny McClintock shares The Story of aptX, Gary Galo reviews Sumiko phono cartridges and new 78 rpm stylus, Richard Honeycutt explains RT Measurement, Frans de Wit tackles the design of a DC Power Supply, Ken Bird builds a pair of tower speakers with Oaktron drivers manufactured in the US, and Christopher Paul writes about Triode Common Cathode Stages and its controversies.

Designed in collaboration with the Department of Mechanical And Industrial Engineering at the prestigious Brescia University in Lombardy, and engineered in Italy by Outline, the new Globe Source Radiator (GSR) high-power omnidirectional sound source solution provides a vital tool for acoustic analysis. Complemented with the Outline NG01 noise generator that can be controlled with a radio remote control, and the portable Outline L3000 DSP amplifier, the GSR offers a high-SPL solution for acoustics measurements in all environments, including large venues and spaces.

For his audioXpress monthly column Sound Control, Richard Honeycutt explored new methods to calculate the edge effect of acoustical absorption and the research behind these methods. The research focuses on the recognized fact that rooms in which Reverberation Time (RT) is important, requiring the application of absorptive wall panels, seem to achieve better results when the absorptive material is applied only to parts of each wall. The physical reasons behind this apparent anomaly are often lumped into the category of "edge effect." This article was originally published in audioXpress, December 2017.

From March to August 2014, in its Sound Control column dedicated to acoustics, Richard Honeycutt reviewed and wrote a series of articles on the evolution of predictive acoustics and acoustical modeling software, including a review of some of the available tools. This second article in the series focused on one of those available tools: Bose Modeler. This article was originally published in audioXpress, April 2014.

From March to August 2014, in his Sound Control column dedicated to acoustics, Richard Honeycutt reviewed and wrote a series of articles on the evolution of predictive acoustics and acoustical modeling software, including a review of some of the available tools. This first article in the series revisits Sabine’s reverberation time equation, all the way to the use of impulse responses and ray-tracing and convolution auralization techniques using modern computers. This article was originally published in audioXpress, March 2014.

Measuring the sound insulation and reverberation time in multi-roomed buildings can become pretty tiring. Carrying a heavy amplifier and loudspeaker from room to room is also cumbersome. To better support the work of audio professionals and acousticians in their daily work, NTi Audio has developed a new lightweight, yet robust omnidirectional sound source, the DS3 Dodecahedron, together with the powerful PA3 Power Amplifier.

Loudspeaker modeling files are most often used with acoustical modeling programs such as EASE, Focus, CATT-Acoustic, and others to help determine how well the loudspeakers cover the audience areas and how much “spill” there is on the room’s surfaces. It is important to have accurate data about the characteristics of the loudspeakers that are used in the models. In this article, we will detail some of the requirements to help assure good measurement data for use with loudspeaker modeling. This article was originally published in Voice Coil, April 2017.

This month, audioXpress features an updated version of the Willow amplifier, especially designed for the DIY community, and a three-way loudspeaker project with an external active crossover network. We visited Eighteen Sound in Italy, discuss experiments with Dolby Atmos, audio networking development based on Audinate’s Dante technology and learn how to measure Reverberation Time (RT). And if you are interested in recreations of the famous Fairchild compressor/limiters, rectifier tubes, and how to properly test tubes, don’t miss this month’s audioXpress.