audioXpress Magazine - October 2017

In this issue

14 Good Memories! Essential Knowledge? By João Martins Paul Hetrelezis wrote Retro Audio as a service guide for repairing analog and earlier digital audio consumer equipment, summing up his knowledge accumulated over decades.
16 Markaudio-Sota Viotti A Speaker Design Statement By Stuart Yaniger Stuart Yaniger reviews Markaudio-Sota’s new flagship speaker, the Viotti One, a two-way, stand-mount loudspeaker.
26 Virtually Tuning an Automotive Audio System By Valerio Marra Get an insider’s view of the physical experiments experts at HARMAN are conducting in conjunction with mathematical modeling and numerical simulation to improve the development process for the latest vehicle infotainment technology.
30 The Denali Voltage Reference By Christopher Paul Many audio power and preamplifier designs benefit from the use of voltage regulators. This article focuses on linear regulators and how feedback networks affect their performances, particularly in the higher voltage applications that vacuum tube amplifiers demand.
42 Build the Mojo Maestro By Ethan Winer Convinced that distortion can be achieved without expensive summing mixers or other devices with tubes and transformers, Ethan Winer has built an inexpensive device that provides a controlled amount of soft-clipping by using two diodes and a few resistors.
48 Modern JFETs in Audio Circuits By Dimitri Danyuk The article describes a high-quality DC-coupled all-JFET amplifier, inspired by the designs of John Curl and Erno Borbely. IT’S ABOUT THE SOUND 8 Vinyl vs. CD (Part 1) Measuring the Sound Difference By Ron Tipton
QUESTIONS & ANSWERS 38 Engineer Follows Dream, Opens Own Audio Design Company An Interview with Mark Schneider, of Linear Tube Audio By Shannon Becker
Hollow-State Electronics 60 The Circlotron Power Amplifier By Richard Honeycutt