audioXpress - December 2021
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December 2021 issue Digital Access. - Magazine Details
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Magazine Description
In this issue
FROM THE EDITOR’S DESK—A New Chapter in Audio Development, by J. Martins, p. 4 MARKET UPDATE—The Self-Calibrating Loudspeaker, by J. Martins, p. 8 MARKET UPDATE—The Arrival of Spatial Room Correction Technology, by Lars-Johan Brännmark, p. 20 Dayton Audio DAX88, An Eight-Source, Eight-Zone Distributed Audio Matrix Amplifier: Setting Up a Whole-House Audio System, by Thomas Perazella, p. 24 Directivity Measurement of In-Wall Loudspeakers, by Christian Bellmann, Ruben Hauschild, and Mattia Cobianchi, p. 30 Improved Loudspeaker Crossover: For the Parts Express “Solstice” Kit, by Richard Modafferi, p. 36 SOUND CONTROL—Miking the Audience, by Richard Honeycutt, p. 43 Thinking About DC Power Supplies (Part 1): Circuits Used as Potential Power Sources, by Frans de Wit, p. 46 Cascodes, Folded Cascodes, and Current Mirrors (Part 3): Using a Test Circuit, by Morty Tarr, p. 52 Simple Xtal-Based Motor Control for Turntables, by Michel Nieuwenhuizen, p. 58 HOLLOW-STATE ELECTRONICS—Sbuminiature Tubes and Effectrode Pedals, by Richard Honeycutt, p. 62
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Accuracy in LTspice Modeling
Sometimes we need to consider the human factor when using circuit design simulation tools. In this article, our hollow-state expert details an error that occurred in a past article, which is now being corrected.
Transitioning Audio Tests from R&D to the Production Line
Production line audio testing poses many challenges such as noisy environments, harsh operating conditions, high throughput, relative limits, and more. In this article, Steve Temme shares his observations and outlines the main considerations to ensure a successful operation.
Acoustical Measurement and DSP Application in Automotive Audio
This article offers a primer on how to approach acoustic measurements and the practical application of DSP in car cabins, one of the hardest acoustic environments for quality sound reproduction. The topics addressed in this article will be expanded in future articles.
Power Transformer Parameters, Selection, and Testing
The initial group of articles focused on the history of transformer cores, construction methods and materials, and various testing methods. After having discussed the parameters of transformers, this article expands on their losses.
Modern PC Board Design Practices
Tips and Techniques
Lumped Element Modeling of Transducers
Many engineering tasks require a common ground from which discussions among those involved in a project can take place in a structured manner. This will often involve a so-called model of the concept or product, and this article discusses one such model: the lumped element model.
Burkhard Vogel's Slopes and Levels
Spice Models to Simulate Vintage Op-Amp Noise
Modular Evolution in Audio Testing
The audio industry continues to benefit from significant progress in advanced software as well as modular hardware solutions. This overview of the latest audio and industry-related test and measurement solutions identifies market trends for this critical segment.
Echo AIO
A Cost-Effective Audio Test System
Power Transformer Parameters, Selection, and Testing
Part 6 - Quality, Reliability, and Design
