CATEGORIES

The Benefits of Using Structure-Borne Sound in Headset Signal Processing
audioXpress

The Benefits of Using Structure-Borne Sound in Headset Signal Processing

This article details the latest testing strategies for bone conduction technology used in product development for headsets and in-ear devices. It showcases new possibilities for manufacturers to better evaluate device performance, since no appropriate test equipment and methods were commercially available until now.

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6 mins  |
January 2023
Building a Haptic Dimension The Science Behind the Taction Transporter
audioXpress

Building a Haptic Dimension The Science Behind the Taction Transporter

Haptic motors are finding applications in gaming, music, VR/AR, and therapeutic/wellness. The Transporter is a patented transducer that delivers faster more accurate bass and is designed to work with the main audio driver in headphones. It subtly vibrates against the user’s skin to produce an extra dimension that can be described as a high-fidelity extension.

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10 mins  |
January 2023
Bone Conductors Going Mainstream
audioXpress

Bone Conductors Going Mainstream

Bone conduction technology that sends vibrations directly to the inner ear, bypassing the eardrums, is seeing increasing use-evolving from its origins in medical hearing devices to mainstream consumer and strategic communication applications. The advantages in open-ear wireless applications have great appeal and the audio industry is responding.

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10+ mins  |
January 2023
Unusual Tubes
audioXpress

Unusual Tubes

Most aficionados of hollow-state electronics—at least most of the people reading this column—are familiar with the tubes most commonly used in classic or contemporary audio amplifiers. In this article, we explore some of the less common tube types used for audio applications.

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6 mins  |
December 2022
Power Transformer Parameters, Selection, and Testing
audioXpress

Power Transformer Parameters, Selection, and Testing

Part 2 Transformer Cores and Their Construction Methods,  In the second part of this article series, Chuck Hansen details the history of transformer cores and shares information about their various construction methods.

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8 mins  |
December 2022
The LNA-100 A Low Noise Amplifier with Filters and a RMS Voltmeter
audioXpress

The LNA-100 A Low Noise Amplifier with Filters and a RMS Voltmeter

This project describes the design and construction of the LNA-100 device, which comprises a low noise, high gain amplifier with three different gain settings, six filters for bandwidth restriction, and a True RMS voltmeter that gives a DC voltage at its output.

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10+ mins  |
December 2022
Using Ultra-Wideband Technology Wireless Delivery of Audio and Multimedia
audioXpress

Using Ultra-Wideband Technology Wireless Delivery of Audio and Multimedia

For tomorrow’s audio and AR/VR devices, Ultra-Wideband UWB) technology provides high throughput, low latency, and low power connectivity for body and personal area networks—even in congested environments. UWB complements Bluetooth and Wi-Fi with high-performance and mobile-friendly short-range wireless connectivity.

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7 mins  |
December 2022
Improving Wireless Audio
audioXpress

Improving Wireless Audio

Part 2 Evolution and Exciting Perspectives, Even though key technologies remain in development, wireless audio evolution beyond Bluetooth offers some very promising perspectives to the industry. Let's look at the efforts and the most promising platforms and technologies for wireless audio.

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10+ mins  |
December 2022
The Proof Is in the Testing
audioXpress

The Proof Is in the Testing

The Klippel Near Field Scanner (NFS) System was used for the development of Holoplot's X1 Matrix Array compensation algorithms, which was the topic of an article in the September 2022 issue of audioXpress. This joint article by Holoplot and Klippel offers a deep dive into the one of the many benefits of the innovative technology from the Berlin, Germany-based company.

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9 mins  |
December 2022
Take the Lead in Acoustics with COMSOL Multiphysics®
audioXpress

Take the Lead in Acoustics with COMSOL Multiphysics®

Multiphysics simulation drives acoustics innovation by providing insight into every design aspect that influences product performance. The ability to account for coupled physics phenomena lets you predict, optimize, and virtually test a design under realworld conditions - even before a first prototype is built.

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10+ mins  |
December 2022
Installation, Distributed Audio, and Multiroom
audioXpress

Installation, Distributed Audio, and Multiroom

Following the previous Market Update on residential integration, audioXpress explores the latest audio installation trends and solutions. Complementing the residential perspective, the article also addresses the latest audio multiroom approaches and technologies, an area that is clearly on the verge of serious evolution in 2023.

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2 mins  |
December 2022
The Home Audio Perspective
audioXpress

The Home Audio Perspective

Since the adoption of automation systems and home networks, residential integration has evolved gradually to connected systems and is now increasingly associated with the transition to the Smart Home.

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10+ mins  |
October 2022
Old-Timer, Williamson, and Ultralinear Amplifiers: Families of Hollow-State Power Amplifiers
audioXpress

Old-Timer, Williamson, and Ultralinear Amplifiers: Families of Hollow-State Power Amplifiers

The July and September Hollow-State Electronics articles examined the distortion performance of the three families of amps. This article recaps those findings and compares them to the last two families, the Williamson and ultralinear amps.

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6 mins  |
October 2022
Considerations Concerning RT Measurement
audioXpress

Considerations Concerning RT Measurement

In this article, our acoustics expert explains the history behind the reverberation time (RT) measurement and its importance. He then shares his preferred procedure for measuring RT.

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6 mins  |
October 2022
All American Tower Speakers
audioXpress

All American Tower Speakers

In this article, our experienced speaker builder takes us along with him on his quest to build a loudspeaker made solely from drivers manufactured in the United States.

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6 mins  |
October 2022
Making a DC Power Supply with Audible Benefits: Choosing the Design
audioXpress

Making a DC Power Supply with Audible Benefits: Choosing the Design

Following the two articles exploring multiple power supply circuits with potential for high-end audio applications (audioXpress December 2021 and January 2022), Frans de Wit details a high-quality power supply especially targeted toward preamplifiers, record-players, and other low power appliances.

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10 mins  |
October 2022
Triode Common Cathode Stages, the Oracle Equation, and Theodosian Objections
audioXpress

Triode Common Cathode Stages, the Oracle Equation, and Theodosian Objections

For those readers interested in tube amplification, this article proposes a simplified equation of what might appear to be multiple mathematical factoids into a single concept, intended to help characterize and understand triode circuits.

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10+ mins  |
October 2022
Replacing IEC 60268-5: The Importance of Measurements
audioXpress

Replacing IEC 60268-5: The Importance of Measurements

Geoff Hill concludes his discussion about the work taking place on loudspeaker measurement standards, and the progress the International Electrotechnical Commission (IEC) has made with its standards efforts.

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7 mins  |
October 2022
The Story of aptX: An Epic Journey
audioXpress

The Story of aptX: An Epic Journey

From film sound to radio broadcasts, studios, and finally to Bluetooth and more than 12 billion devices, the successful story of aptX technology is inextricably linked to the history of digital audio. A remarkable corporate journey.

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8 mins  |
October 2022
Sumiko Phono Cartridges and RS78 78 rpm Stylus
audioXpress

Sumiko Phono Cartridges and RS78 78 rpm Stylus

Sumiko recently announced four new phono cartridges and one new stylus. This article reviews the new Sumiko Olympia and Wellfleet phono cartridges, and the new RS78 stylus, Sumiko's first 78 rpm solution, meeting the needs of many vintage recording enthusiasts.

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10+ mins  |
October 2022
HDMI Specification 2.1 Improves Home Theater Audio With eARC
audioXpress

HDMI Specification 2.1 Improves Home Theater Audio With eARC

The new HDMI standard adds a unique feature to preserve AVR compatibility. In this article, Marshall Goldberg explains how Enhanced Audio Return Channel (eARC) works.

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6 mins  |
September 2018
The Brioso Speakers - Lively Two-Way Speakers With Transmission-Line Bass
audioXpress

The Brioso Speakers - Lively Two-Way Speakers With Transmission-Line Bass

The Brioso uses a Scan-Speak Revelator midwoofer and a Transducer Labs Alumina ceramic dome tweeter in a floor-standing, mass-loaded transmission-line (ML-TL) enclosure. Paul won first place for this design in the over-$200 category in the 2017 Midwest Audiofest (MWAF) event held by Parts Express.

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8 mins  |
September 2018
Miking Solo Voices And Instruments- The Mic Choices
audioXpress

Miking Solo Voices And Instruments- The Mic Choices

Although there are many microphones, from which to choose, you need to consider several important acoustical factors to obtain good results.

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8 mins  |
July 2018
The Challenges Of Live Recordings
audioXpress

The Challenges Of Live Recordings

Making a high-quality audio recording in a recording studio is one thing, but making a similar recording at a live concert has its own challenges. Neville Roberts flies out to Venice, Italy, to investigate.

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10+ mins  |
August 2018
Comsol Multiphysics Acoustics Module
audioXpress

Comsol Multiphysics Acoustics Module

Making the Case for Acoustic Modeling and Simulation Apps

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3 mins  |
August 2018
Acoustics In Performance
audioXpress

Acoustics In Performance

In this book, Richard Honeycutt details “all you need to know about good acoustics and sound systems in performance and worship spaces.” audioXpress and Voice Coil readers will be familiar with Richard A. Honeycutt’s writings, including audioXpress’ Hollow- State Electronics column, dedicated to exploring all tube-related electronics, and his Sound Control column, dedicated to everything in acoustics. Richard has also contributed to Voice Coil since 1994, so the author knows his subject matter.

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3 mins  |
May 2018
Schiit Audio's High-Value Ideas
audioXpress

Schiit Audio's High-Value Ideas

Unless you’ve been away from hi-fi for the past few years, you’ve probably heard of Schiit Audio, a high-value brand available at reasonable prices. Over the years, Schiit Audio owner Jason Stoddard and I have talked at trade shows and I recently caught up with Jason to talk about his company.

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10+ mins  |
May 2018
audioXpress

DIY Tube Amplifier Heat Management Options

The objective of this article is to illustrate some methods to greatly increase the performance and reliability of your DIY tube amplifier. I’m only discussing DIY tube amplifiers since they generate the most heat per watt of audio output and are hopefully of the most interest to you. Most designs that I have seen in audioXpress have the tube and the transformers on top of the chassis and everything else under the chassis. Most of the amplifiers look nice and work okay, but I think there is a better way!

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7 mins  |
May 2018
​​​​​​​Thoughts On AES X223 And X241 Speaker Measurement Projects
audioXpress

​​​​​​​Thoughts On AES X223 And X241 Speaker Measurement Projects

I have just returned from the recent Audio Engineering Society (AES) 144th International Convention in Milan, Italy, where I was among many colleagues who are trying to solve one of the outstanding problems of loudspeaker drive units today. Namely, being able to trust the measurements that are being presented to us.

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9 mins  |
September 2018
Sonarworks Reference 4 Studio Edition- Loudspeaker And Headphone Correction System
audioXpress

Sonarworks Reference 4 Studio Edition- Loudspeaker And Headphone Correction System

Stuart Yaniger takes a look at Sonarworks, a relatively new entry into this market and its main offering—the Reference 4 Studio Edition, which is clearly targeted to studio and mastering use but can certainly be used in home audio setups.

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10+ mins  |
July 2018

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