All items in category Theory Articles
Choosing and Using Electronic Parts: A Survival Guide, Part 1
by Charles Hansen

Choosing and Using Electronic Parts: A Survival Guide, Part 1

Everything you need to know about how parts function, and how to select and maintain them. In the first part of this article, the author discusses damaging effects of high temperatures, why things fail, MTBF, component tolerances and the effects of shock and vibration. This article series was published in audioXpress, from November 2001 to January 2002.
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A New Approach to Loudspeaker Measurements
by Dave Logan

A New Approach to Loudspeaker Measurements

Recently, there has been increased demand for loudspeaker 3-D directivity measurements both in the near- and far-fields for different applications. New holographic near-field scanning techniques provide new ways to determine the sound pressure at any point in the 3-D sound field. This article was originally published in Voice Coil, May 2015.
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A Simple and Safe Solution for Ground Connection Interferences

A Simple and Safe Solution for Ground Connection Interferences

Switched mode circuits are increasingly being used today in electronic devices. Due to the rapid switching speeds found in these switched mode circuits, the probability of high frequency ground connection interferences is also becoming more prevalent. A correctly specified and placed ground choke, using Schurter’s range of power IEC modules with line filter and optional voltage selector (step switch), offers a simple and safe solution.
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Sources 101: Audio Current Regulator Tests for High Performance - Full Article
by Walt Jung

Sources 101: Audio Current Regulator Tests for High Performance - Full Article

In April and May 2007, audioXpress published a two-part article by Walter G. (Walt) Jung, noted designer and author of the IC Op Amp Cookbook and IC Op Amp Applications book series. In this article - still being referenced to date - the author discusses audio current regulator circuits and their performance with regard to power-supply-related noise. Read the two-parts plus addendum letters.
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Current Source Amps and Sensitive/Full-Range Drivers
by Nelson Pass

Current Source Amps and Sensitive/Full-Range Drivers

In this fascinating article, published in audioXpress, October 2004, Nelson Pass investigates loudspeaker performance when driven by a current source amp. This extensive research shows what Pass and Kent English found with a variety of full-range sensitive loudspeaker drivers when they drove them with an active current source and played with parallel networks to shape the response to their liking.
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Current Source Crossover Filters
by Nelson Pass

Current Source Crossover Filters

In this article published originally by audioXpress in March 2005, Nelson Pass offers a series of tips about designing filter networks for both voltage and current sources. Nelson Pass provides filter examples that can be used equally well with a voltage or current source.
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Driver Selection for Multi-Way Speakers
by Richard Honeycutt

Driver Selection for Multi-Way Speakers

It was recognized early on that the speakers benefited from having separate low-frequency and high-frequency drivers, each optimized for its own frequency range. Consequently, names were needed to easily identify the various speakers in a cabinet. This article was originally published in Voice Coil, January 2012.
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Subwoofer Alignment with Full-Range System
by Charlie Hughes

Subwoofer Alignment with Full-Range System

In this tutorial Charlie Hughes addresses the question of “How do I align a subwoofer with a full-range loudspeaker system?”. He answers the problem by addressing the three main issues of crossover frequencies, relative output level and delay. This article was originally published in Voice Coil November 2011.
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The Sweet Spot
by Nelson Pass

The Sweet Spot

What can you do to ensure the best possible sound from your system? According to Nelson Pass, the “sweet spot” concept is generally regarded as “that happy balance of conditions that elicits the best possible sound,” including the interiors of the components themselves. This article was originally published by audioXpress, January 2010.
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Constant-Voltage Source Impedance Measurements
by Charlie Hughes

Constant-Voltage Source Impedance Measurements

In this article, the author addresses possible scenarios when measuring loudspeaker input impedance at drive levels closer to those used in actual operation, including problematic examples with vented loudspeaker enclosures and constant voltage distributed system transformers. This article was originally published in Voice Coil, February 2011.
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