All items tagged with harmonic distortion (11)

Practical Test & Measurement Testing Power Amplifiers

June 17, 2025 by Adam Liberman

Practical Test & Measurement Testing Power Amplifiers

Power amplifiers present a unique set of testing challenges that are usually not encountered with digital or low-level analog circuits, as they must supply significant current as well as voltage to their loads. This comprehensive checklist on what is needed for testing power amplifiers covers the fundamental measurements, with specifics on how to best accomplish the tests using Audio Precision's APx series audio analyzers and APx500 measurement software.

Measure Your Audio and Evolve Your Design Skills with audioXpress March 2024

February 12, 2024 by audioXpress Staff

Measure Your Audio and Evolve Your Design Skills with audioXpress March 2024

The March 2024 issue of audioXpress includes an overview of the latest Audio Test and Measurement solutions, a review of the Listen SoundCheck 21 and AmpConnect 621 test suite, and a tribute to 20 years of Room EQ Wizard (REW). Learn how to build a True-RMS Voltmeter and what's behind the myth of Second Harmonic Distortion. Learn how motion feedback technologies can be applied to speakers, and how our hearing process affects our audio listening experiences, and much more. Dive in now!

Measuring Loudspeaker SPL Response and Harmonic Distortion at Low Frequencies

November 8, 2023 by Reinhold Lutz

Measuring Loudspeaker SPL Response and Harmonic Distortion at Low Frequencies

This article discusses how to measure loudspeaker SPL response and harmonic distortion at low frequencies in a standard environment, full of reflections from acoustically hard boundaries (e.g., walls, floor, and ceiling), room resonances, and even ambient noise reducing the dynamic range and accuracy of the measurements. The method combines near-field measurements with two identical microphones. This article was originally published in audioXpress, October 2023.

USound Improves Performance of MEMS Speaker-Based Audio Systems with New Active Linearization Algorithm (ALA)

May 16, 2023 by audioXpress Staff

USound Improves Performance of MEMS Speaker-Based Audio Systems with New Active Linearization Algorithm (ALA)

USound announced the availability of Active Linearization Algorithm (ALA), a new signal processing tool that helps reduce the total harmonic distortion (THD) of MEMS speakers. According to the Austrian company, the new software tool sets new standards in the development of over-the-counter (OTC) hearing aids and true wireless stereo (TWS) headphones and was developed to assist audio systems developers in their efforts to improve the THD performance of MEMS-based products.

Speakers: The Evolution of Production Line Rub & Buzz Measurements

July 14, 2022 by Steve Temme

Speakers: The Evolution of Production Line Rub & Buzz Measurements

This important article revisits the evolution of Rub & Buzz measurements in loudspeakers, headphone drivers, and microspeakers production lines, and how these are being addressed using the next-generation of perceptual algorithms. Steve Temme offers a valuable comparison with what can be accessed today using modern methods, and what to apply to access production faults, determine thresholds for production yields, or understand the real impact on consumer's perception. This article was originally published in audioXpress, April 2022.

Some Speaker Problems That Needed Solving

October 7, 2021 by Bruno Putzeys and Lars Risbo

Some Speaker Problems That Needed Solving

In this article for Voice Coil, the two co-founders of Purifi Audio share some details about the company's unique research with loudspeakers, and reveal their findings in looking for the roots of speaker nonlinearities and distortion mechanisms. A research effort that the authors believe deserves consideration from the industry, as a new set of standard parameters that should be included in datasheets. This article was originally published in Voice Coil, August 2021.

Practical Test & Measurement - Stop Worrying About Coupling Capacitors!

May 26, 2020 by Ethan Winer

Practical Test & Measurement - Stop Worrying About Coupling Capacitors!

Another great research article from Ethan Winer, where he designed a simple device that measures capacitor distortion using a USB sound card and free software to try and determine the importance of high-quality capacitors in the signal path. This article details the results of his tests with different capacitor types. This article was originally published in audioXpress, May 2020.

Distortion Meter and Audio Interconnect Tester

May 13, 2020 by Ed Simon

Distortion Meter and Audio Interconnect Tester

In this article for audioxpress, Ed Simon writes: "There seems to be controversy over what testing means in audio. Measuring a difference does not mean you can hear it. On the other hand, if my ears tell me there is a difference between two audio chains and I cannot measure it, that does not mean it is not there. Probably, I'm just using the wrong method to determine audio differences." And after trying to measure all sorts of things to compare which ones sounded fine - or not - he decided the next step would be to build a dedicated more sensitive measurement. This article was originally published in audioXpress, November 2009.

New Features and Updates from Klippel for Speaker Designers and Manufacturers

March 23, 2020 by audioXpress Staff

New Features and Updates from Klippel for Speaker Designers and Manufacturers

The specialists in electro-acoustical transducers and audio systems test equipment at Klippel GmbH continue hard at work on updating their range of products, recently expanded with the Klippel Controlled Sound Technology (KCS) and adding on the existing features for the Klippel Analyzer System. Here is a summary of the main things that the company implemented recently, including updates to its dB-Lab software and the QC Software Framework.

audioXpress March 2017, Focus on Test and Measurement, Now Available!

February 13, 2017 by audioXpress Staff

audioXpress March 2017, Focus on Test and Measurement, Now Available!

A long-standing tradition, audioXpress' Focus on Test and Measurement 2017 is now available. Start with a thorough review of Audio Precision’s new APx1701 Transducer Interface; explore the DIM-100 device for interfacing and measuring with sound cards; build an Audio Dummy Load; learn how to measure Harmonic Distortion and discover the effects of Community Noise and their measurements. And just how good TIDAL's streaming quality actually is? All that and more in audioXpress March 2017. Get your copy now.

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