All items tagged with March 2019 (10)

Build a Discrete High Output Current Buffer with JFET Input

June 24, 2021 by Dimitri Danyuk

Build a Discrete High Output Current Buffer with JFET Input

This article from Dimitri Danyuk explores ways to provide better isolation between input and output terminals and lower input noise current using JFETs from Linear Integrated Systems. For unity-gain buffer applications there are many open-loop IC buffers on the market based on bipolar technology. They are mostly complementary emitter followers connected in series. With the appearance of complementary JFETs from Linear Integrated Systems, it is possible to construct a discrete buffer with JFET input. This article was originally published in audioXpress, March 2019.

Fresh From The Bench: Examining the miniDSP EARS Headphone Test Fixture

September 18, 2019 by Stuart Yaniger

Fresh From The Bench: Examining the miniDSP EARS Headphone Test Fixture

In the March 2019 edition of audioXpress, focusing on Test and Measurement, Stuart Yaniger explored the new Earphone Audio Response System or EARS, which miniDSP introduced as an affordable test jig for headphone measurements. Basically, this is a plug & play USB audio streaming device, featuring dual low noise calibrated mics with interchangeable silicon ears. But is it really the answer to bring "headphone measurements to the masses," as the manufacturer intended?

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Loudspeaker Enclosure Materials (Part 1)

July 24, 2019 by Mike Klasco

Loudspeaker Enclosure Materials (Part 1)

In this article for Voice Coil, Mike Klasco (Menlo Scientific, Ltd.) reviews and looks ahead at all the materials and design approaches for loudspeaker enclosures. This article discusses enclosures using wood, MDF, plastic, plastic composites, moldable materials, coatings and pairings for those materials, while also looking at new cutting-edge bio-plastics materials. This article was originally published in Voice Coil, March 2019.

Test Bench: The SB Acoustics Satori TW29DN-B-8 Tweeter

June 12, 2019 by Vance Dickason

Test Bench: The SB Acoustics Satori TW29DN-B-8 Tweeter

In this Test Bench we will be looking at the 29 mm TW29DN-B cloth dome tweeter from the SB Acoustics Satori line of high-end devices. This new TW29DN-B-8 SB Satori tweeter is a wide surround format-type similar to the original Vifa DX tweeter, or the current Scan-Speak D2604 or D2607. However, all of these are 26 mm diaphragm tweeters, and the new Satori ST29DN-B-8 is a 29 mm diaphragm type. This article was published in Voice Coil, March 2019.

Test Bench: The SB Acoustics SB29BNC-C000-4 Tweeter

June 5, 2019 by Vance Dickason

Test Bench: The SB Acoustics SB29BNC-C000-4 Tweeter

This month I am characterizing the SB29BNC beryllium 29 mm dome tweeter from SB Acoustics. This is the second high-end 29 mm beryllium diaphragm neodymium dome sent by SB Acoustics for Test Bench. Features for this transducer include a small format 72 mm diameter injection-molded plastic faceplate, and an 8 mm wide coated cloth surround. This article was published in Voice Coil, March 2019.

Test Bench: A New Beryllium Tweeter from BlieSMa

May 23, 2019 by Vance Dickason

Test Bench: A New Beryllium Tweeter from BlieSMa

This Test Bench characterizes the T34B-4 34mm beryllium dome tweeter from BlieSMa, a German company founded in 2018 by Stas Malikov. BlieSMa’s first tweeter offering, the T34A-4 34 mm aluminum/magnesium alloy dome, appeared in Voice Coil’s June 2018 Test Bench. This month, I received the company’s second offering, and it seems logical that this driver, the T34B-4, is a 34 mm beryllium dome tweeter. This article was published in Voice Coil, March 2019.

New Stratified Stream Port Technology from Quest Engines

May 15, 2019 by Elario Dalmas II

New Stratified Stream Port Technology from Quest Engines

On this Voice Coil Spotlight article, Elario Dalmas II (Quest Engines) details how his company's Stratified Stream Ports can improve vented box systems. Quest Engines has developed an innovative patent-pending speaker port technology that allows for new visual and sonic aesthetics in the design of vented box speaker systems, using see-through ports. This article was originally published in Voice Coil, March 2019.

Practical Test & Measurement: Attenuators for Measurement

March 27, 2019 by Jonathan Novick

Practical Test & Measurement: Attenuators for Measurement

In this article for audioXpress, Jonathan Novick explains why the use of external attenuators are an effective and cost-effective way to measure signals above the maximum input voltage of an audio analyzer. Novick explains why there needs to be some consideration of the topologies and different attributes offered by such components for audio noise measurements. He compares the impact different attenuators’ thermal noise will have on measurements of distortion. This article was originally published in audioXpress, March 2019.

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Expanded Perspectives on Loudspeaker Enclosure Materials with Voice Coil March 2019

February 26, 2019 by audioXpress Staff

Expanded Perspectives on Loudspeaker Enclosure Materials with Voice Coil March 2019

Voice Coil March 2019 is now available and this issue focuses on the vital, but seldom addressed, topic of loudspeaker enclosure materials. Mike Klasco reviews and looks ahead at all the materials and design approaches for loudspeaker enclosures, and the edition also includes a complete directory for sourcing vendors in this area. James Croft reviews a Coaxial Centerbody Point-Source (CCPS) Horn Speaker System patent, and Vance Dickason characterizes three new tweeters on Test Bench.

audioXpress March 2019 Is Now Available. Time for Audio Test and Measurements!

February 11, 2019 by audioXpress Staff

audioXpress March 2019 Is Now Available. Time for Audio Test and Measurements!

Get to the bench, it's Test and Measurement time. In this edition, you will find a Market Update with the latest audio measurement solutions available to the audio industry. Stuart Yaniger reviews the new Earphone Audio Response System from miniDSP, Joe Begin explains how to measure speech intelligibility, and Jonathan Novick details how to use external attenuators for measurements. Geoff Hill discusses why total system efficiency should be the target in loudspeaker design, and Dimitri Danyuk explores a discrete high output current buffer with JFET input.