audioXpress - July 2018

8 AXPONA 2018
The Renaissance of High-Quality Sounds
By Oliver A. Masciarotte
Oliver Masciarotte provides an insider’s view of Audio Expo North America (AXPONA). The three-day event featured listening rooms, the Exhibit Hall with the Ear Gear Expo and the Record Fair, several seminars, and live musical performances.

18 Back EMF Phase Relationships in Moving-Coil Loudspeakers (Part 3)
“Slip” Creates Inductive, Capacitive, or Resistive Back EMF
By Andy Lewis
In the third part of this article series, Andy Lewis discusses the concept of slip in order to explain its effects on impedance.

30 Sonarworks Reference 4 Studio Edition
Loudspeaker and Headphone Correction System
By Stuart Yaniger
Stuart Yaniger examines the Reference 4 Studio Edition, targeted to studio and mastering sound calibration but can also be used in home audio setups.
42 Current Feedback: Fake News or the Real Deal? (Part 1)
Untangling the Signal Path
By Christopher Paul
This article employs bench tests, simulations, and equations derived from various circuits to test the existence of current feedback.

48 Transformers for Tube Amplifiers (Part 3)
Choosing the Right Transformer
By Gerhard Haas
In this final article of the series, we will discuss long-term stability and how to select the right transformer.

sound control
24 Miking Solo Voices and Instruments
The Mic Choices
By Richard Honeycutt


Questions & Answers
38 Breathing New Life Into a DIY-Oriented
Audio Company
An Interview with Kerry Armes and Dan Poinsett of Creative
Sound Solutions
By Shannon Becker
Hollow-State Electronics
60 Design and Performance of Power Supplies for
Hollow-State Amplifiers
By Richard Honeycutt