audioXpress - March 2018

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8 An Audio Legend Remembered C. Victor Campos (1933–2017) By Gary Galo and Chuck Hansen
12 Audio Editing Software Roundup (Part 4) Audio Tools But Not DAWs By Fernando Rodrigues
18 Smart Speakers By Daniel Knighten and Glenn Hess This article describes techniques to characterize the frequency response, output level, and distortion of a device under test to enable direct comparisons between smart speakers and conventional speakers.
24 G.R.A.S. Sound & Vibration RA040X Ear Simulator By Brent Butterworth Measuring headphone response at frequencies above-10 kHz has been an imprecise, non-standardized process. With the RA040X high-resolution ear simulator, G.R.A.S. Sound & Vibration attempts to make the measurements more meaningful. 30 IK Multimedia ARC 2.5 Advanced Room Correction System Even More Reliable Consistent Sound By Ron Tipton In this month’s special Test & Measurement Focus, two of our authors tackle IK Multimedia’s ARC 2.5 System.
40 IK Multimedia ARC 2.5 The MEMS Test Microphone By Stuart Yaniger Stuart Yaniger tests the new MEMS measurement microphone available with IK Multimedia’s ARC 2.5 System.
46 An Introduction to Measurement Microphones By David Mathew Learn more about the measurement microphones used by professionals working in acoustic test.
52 Perseverance and Innovation Leads to Success An Interview with Steve Temme, President of Listen, Inc. By Shannon Becker
58 Options for PCB Fabrication By Scott Dorsey PCB finishes in this brief tutorial, enabling DIYers to make more informed choices when they send their boards out for fabrication.
62 Triode Tubes, BJTs, and FETs