audioXpress 2019 Back Issues on CD

audioXpress 2019 Back Issues

January 2019
FROM THE EDITOR’S DESK—Exciting Times to be in Audio, by J. Martins, p. 4
Rocky Mountain Audio Fest 2018: A Personal Listening, by Erik Owen, p. 8
MARKET UPDATE—MICORPHONES: Overview of a Changing Market, by J. Martins, p. 16
Breaking the 75 dB+ Microphone Signal-to-Noise Barrier, Mike Klasco, p. 24
The Genesis of the ZYLIA ZM-1 and Next-Generation Audio Recording, by Piotr Szczechowiak, p. 28
The Smart Way of Testing Smart Home Devices: Automated Tests and True-to-Reality Simulations that Take Crucial Factors into Acount, by Hans W. Gierlich, p. 34
Lepai LP40PA mini Stereo Plate Amplifier: Latest Design or Retro Rewind, by David Logvin, p. 42
Closed-Box Subwoofer Equalization: A New Approach, by Joseph D’Appolito, p. 48
The PR-3: A High-Quality Stereo Preamplifier, by George Ntanavaras, p. 58

February 2019
FROM THE EDITOR’S DESK—Fast, Wired Wireless? by J. Martins, p. 4
Spotlight on Pascal, by Ward Maas, p. 8
How to Design and Specify Loudspeaker Drivers, by Richard Honeycutt, p. 18
Assessing the Impact of Device Enclosure Materials, by John Quigley, p. 20
DPA d:vote 4099 Instrument Microphone, by Stuart Yaniger, p. 26
1MORE Triple Driver Over Ear Headphones, by Stuart Yaniger, p. 32
SOUND CONTROL—Noise Isolation for Home Studios, by Richard Honeycutt, p. 38
QUESTIONS & ANSWERS—Industry Pro Envisions Even Better Sound for the Future, by Shannon Becker, p. 42
A Transformer-Coupled Balanced Output for Solid-State Preamps, by Gary Galo, p. 46
An Experimental Cutterhead for Phonograph Disc Recording, by Jim Wood, p. 58

March 2019
FROM THE EDITOR’S DESK—Measurements to the Masses?, by J. Martins, p. 4
MARKET UPDATE—Exploring the Frontiers from R&D to QC, by J. Martins, p. 8
Examining the miniDSP EARS Headphone Test Fixture, by Stuart Yaniger, p. 30
Measuring Speech Intelligibility in Audio Systems, by Joe Begin, p. 38
Attenuators for Measurement, by Jonathan Novick, p. 42
Loudspeaker Efficiency: The Truth Behind the Numbers, by Geoff Hill, p. 48
Build a Discrete High Output Current Buffer with JFET Input, by Dimitri Danyuk, p. 52
HOLLOW-STATE ELECTRONICS—Noise in Vacuum Tube Circuits, by Richard Honeycutt, p. 60


April 2019
FROM THE EDITOR’S DESK—A Smart Future for Voice Hearables, by J. Martins, p. 4
MARKET UPDATE—Hearables and True Wireless Stereo—Maximize Your Hearing, by J. Martins, p. 8
Exploring Qobuz High-Resolution Streaming, by Luke McCready, p. 26
Enabling Higher Quality Audio Capture for Smartphones, by Jyri Huopaniemi and Kai Havukainen, p. 36
Testing Smart Devices, by Steve Temme, p. 40
MARKET UPDATE—Voice Capture—Industry Focus on Voice Applications, by J. Martins, p. 48
SOUND CONTROL—Wave Behavior of Sound in Rooms, by Richard Honeycutt, p. 58
The Geek Columns, by Ken Bird, p. 62


May 2019
FROM THE EDITOR’S DESK—More Tubes, More Sourcing Options, by J. Martins, p. 4
SOUND CONTROL—Miking Instruments: A Few Techniques, by Richard Honeycutt, p. 8
The Nu:Tekt HA-K1 “Tube” Headphone Amplifier by Korg/NuTube: Power, Psychology, and Distortion, by Erik Owen, p. 16
Restoration and Revival of the McIntosh MC30 (Part 1): Rebuilding the MC30, by Bruce Brown, p. 24
A Second Life for a Vintage Tube Amplifier, by Mark Driedger, p. 32
Build a Budget-Friendly High-Performance Valve Headphone Amplifier, by Bruce Heran, p. 36
Desktop Vacuum Tube Headphone Amplifier, by Bill Reeve, p. 40
An Outrageous Mu Stage: An Update of My 1993 Mu Stage Design, by Alan Kimmel, p. 42
QUESTIONS & ANSWERS—Experimentation Opened a Realm of Possibilities: Interview with Shannon Parks, Founder of Parks Audio, by Shannon Becker, p. 46
Searching for a Unicorn (Part 1): Measuring Voltage Regulator Ripple Rejection, by Brian Lowe, p. 52
HOLLOW-STATE ELECTRONICS—Square-Wave Testing, by Richard Honeycutt, p. 58
ARTICLE UPDATE—Corrections to the “Noise in Vacuum Tube Circuits” Article, by Richard Honeycutt, p. 64


June 2019
FROM THE EDITOR’S DESK—Moving Together on USB, by J. Martins, p. 4
SOUND CONTROL—How to Work with an Acoustical Consultant, by Richard Honeycutt, p. 8
MARKET UPDATE—Working with USB-C: What Aduio Developers Need to Know, by J. Martins, p. 14
Building a Null Tester Device, by Ethan Winer, p. 26
Restoration and Revival of the McIntosh MC30 (Part 2): Finishing the Restoration, by Bruce Brown, p. 30
Sigma 100 (Part 1): Designing the Satellite/Subwoofer Loudspeaker System, by George Ntanavaras, p. 36
QUESTIONS & ANSWERS—Innovator Pushes the Envelope of Technology: An Interview with Bradley Pfeifer, by Shannon Becker, p. 42
Searching for a Unicorn (Part 2): Generating a Good Signal Source, by Brian Lowe, p. 50
Measuring Super Regulators, by Jan Didden, p. 58
HOLLOW-STATE ELECTRONICS—More About Noise in Vacuum Tube Circuits, by Richard Honeycutt, p. 60


July 2019
FROM THE EDITOR’S DESK—Class D for Denmark, by J. Martins, p. 4
SOUND CONTROL—Acoustic Design of Music Rehearsal Rooms, by Richard Honeycutt, p. 8
MARKET UPDATE—Power for All Audio Needs, by J. Martins, p. 14
MARKET UPDATE—Why Smart Power Audio Amplifiers Are Becoming Important to Smartphones, by Eric Eklund, p. 24
Powersoft OEM Power Amplifier Modules: Flexible Power for Active Systems, by Ward Maas, p. 28
Dayton Audio HTA20BT Hybrid Stereo Tube Amplifier: Hybrid Power for All, by David Logvin, p. 36
Sonarworks True-Fi Software: The Simple EQ to Fix Your Headphones, by Luke McCready, p. 42
AoIP Delivers on Flexibility, Is Controllability Next? by Matt Hardy, p. 50
Buzz Abatement in Audio Amplifiers, by Chris Lewis and Dimitri Danyuk, p. 56
Sigma 100 (Part 2): Driving the Satellite/Subwoofer Loudspeaker System, by George Ntanavaras, p. 60


August 2019
FROM THE EDITOR’S DESK—Closer With Acoustics, by J. Martins, p. 4
Audio Expo North America (AXPONA) 2019: Rainbows, Unicorns, and Great High-End, by Oliver A. Masciarotte, p. 8
SOUND CONTROL—Variable Acoustics: The Impossible Takes a Little Longer, by Richard Honeycutt, p. 18
MARKET UPDATE—Acoustic Solutions Round-Up 2019, by J. Martins, p. 24
Unraveling the Mystery of Acoustics, by John Calder, p. 34
Good Vibrations (Part 1): The Basic Principles of Unwanted Vibrations, by Norman Varney, p. 40
Why Doesn’t My Stereo Sound Like a Live Concert? By Ethan Winer, p. 44
Kali Audio LP-6 Powered Studio Monitor: Measure of Value, by Stuart Yaniger, p. 50
Swans Speakers DIY Kits: Everything You Need Is Inside the Box, by Ken Bird, p. 58


September 2019
FROM THE EDITOR’S DESK—Accelerating Innovation in Loudspeaker Development, by J. Martins, p. 4
High End 2019: Groundbreaking Evolution, Surprises, and Great Demos in Munich, by Ward Maas, p. 8
Meet PureAudioProject:Trio15 Heil AMT Speakers, by Oliver A. Masciarotte and Kent Peterson, p. 18
The AXL Dipole Loudspeaker, by George Ntanavaras, p. 28
The Echelons: Gor the State-of-the-Art in DIY!, by Dan Neubecker, p. 38
Purifi Audio: A Straight Wire to the Soul of Music, by Jan Didden and J. Martins, p. 46
Good Vibrations (Part 2): The Basic Principles of Unwanted Vibrations, by Norman Varney, p. 52
HOLLOW-STATE ELECTRONICS—Listening to Modeled Amp Designs Using LTspice, by Richard Honeycutt, p. 60


October 2019
FROM THE EDITOR’S DESK—Installation No Longer a Grey Area, by J. Martins, p. 4
2019 Midwest Audiofest Speaker Design Competition, by Thomas Perazella, p. 8
A Look Inside Bob Cordell’s Designing Audio Power Amplifiers, 2nd Edition, by Jan Didden, p. 16
MARKET UPDATE—AUDIO INSTALLATION—Integrated, Networked, and Secure, by J. Martins, p. 20
SOUND CONTROL—Auralization—Building Virtual Acoustic Models, by Richard Honeycutt, p. 32
The DPA d:vice MMA-A Mobile Recording Interface, by Stuart Yaniger, p. 36
Bringing 6DoF to Live Recorded Audio and Video, by Piotr Szczechowiak and Tomasz Zernicki, p. 44
Updating the Rules on Amplifier Metrics, by Jens Tybo Jensen, p. 48
Building a Mini Speaker System: The Bantams, by Thomas Zarbo, Jr., p. 54
HOLLOW-STATE ELECTRONICS—The First Electronic Music Synthesizer, by Richard Honeycutt, p. 62


November 2019
FROM THE EDITOR’S DESK—From Spatial Awareness to Room Emulation, by J. Martins, p. 4
Achieving Frictionless Lower-Power Application Connectivity with Data-Over-Sound, by Dr. Adib Mehrabi, p. 8
The NXP NXH3670 Enables Ideal Wireless Set Experiences, by NXP Semiconductors, p. 15
Benchmark HPA4 Headphone/Line Amplifier, by Gary Galo, p. 16
Hooke Verse Bluetooth Binaural Recording Headphones, by Luke McCready, p. 26
SOUND CONTROL—Is Your Neighborhood Acoustically Friendly?, by Richard Honeycutt, p. 32
AUDIO SCOPE—Can Audio Experts Learn from High-Speed Amplifier Developments?, by Michael Steffes, p. 36
Two Mu Valve Topologies, by Christopher Paul, p. 38
QUESTIONS & ANSWERS—Introducing Aurora Open-Source DSP: An Interview with Raphael Knoop of Auverdion, by Shannon Becker, p. 46
A High-Voltage Delay for Tube Amplifiers: The Sequel, by Jan Didden, p. 50
The Tenacious Bass-8 Powered Subwoofer, by Thomas Zarbo, Jr., p. 54
HOLLOW-STATE ELECTRONICS—The Hammond Growl, by Richard Honeycutt, p. 62


December 2019
FROM THE EDITOR’S DESK—The Magic of DSP, by J. Martins, p. 4
MARKET UPDATE—Cutting-Edge Audio: No Wires, Room Optimized, by J. Martins, p. 8
SOUND CONTROL—Keeping the Sound (or Noise) In or Out, by Richard Honeycutt, p. 24
AUDIO SCOPE—Combining Cascaded Stage Harmonic Distortion, by Michael Steffes, p. 28
Audio Precision APx555 B Series Audio Analyzer: Expanded Capabilities and Software, by Stuart Yaniger, p. 30
The xCORE VocalFusion Speaker Linear Kit by XMOS: How Many Microphones Does It Take to Run Your Life?, by David Logvin, p. 38
Reggie-Phil 2.0: A Current-Regulated Filament Supply, by Christopher Paul, p. 46
Build an 18 W Single-Ended Valve Amplifier with Trans Technology, by Menno van der Veen, p. 54
HOLLOW-STATE ELECTRONICS—Plug-In Modifications for Hollow-State Guitar Amplifiers?, by Richard Honeycutt, p. 60