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In this issue

8 Exploring the Frontiers from R&D to QC By J. Martins In this Market Update, audioXpress highlights some of the latest solutions now available to the audio industry, including updates to some of the most established toolkits as well as new solutions. 30 Examining the miniDSP EARS Headphone Test Fixture By Stuart Yaniger Learn more about the capabilities of “EARS,“ the Earphone Audio Response System, which miniDSP says brings headphone measurement capability to “the masses.” 38 Measuring Speech Intelligibility in Audio Systems By Joe Begin Joe Begin, of Audio Precision, examines the measurement methods currently in use for the objective—and repeatable—evaluation of speech intelligibility. 42 Attenuators for Measurement By Jonathan Novick In this article, Jonathan Novick discusses external attenuators and compares the impact different attenuators’ thermal noise will have on measurements of distortion. 48 Loudspeaker Efficiency The Truth Behind the Numbers By Geoff Hill This article explores why we don’t see more high-efficiency designs in common use and reminds us that it is the total system efficiency that matters. 52 Build a Discrete High Output Current Buffer with JFET Input By Dimitri Danyuk Discover ways to provide better isolation between input and output terminals and lower input noise current using complementary JFETs from Linear Integrated Systems. 60 Noise in Vacuum Tube Circuits By Richard Honeycutt

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