audioXpress - March 2018

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