audioXpress - November 2017

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14 Midwest Audiofest 2017 Outstanding DIY Speaker Designs By Thomas Perazella Thomas Perazella provides an insider’s view as one of the three judges at this year’s Speaker Design Competition held annually during the Midwest Audiofest.
30 OPPO Digital UDP-205 A 4K Ultra HD Audiophile Blu-ray Disc Player By Gary Galo Get an in-depth look at OPPO Digital’s new high-definition Blu-ray disc player, the UDP-205, which Gary Galo confirms is a new reference for stand-alone digital players.
40 Ultimate Ears Pro Sound Tap Personal Monitoring System Your Own Easy-to-Use In-Ear DI Box By Stuart Yaniger Stuart Yaniger puts Ultimate Ears (UE) Pro’s Sound Tap to the test to see how well it performs when relaying sound.
44 Design Considerations for the Optimum Digital ANC Headphone By Peter McCutcheon Learn more about the constraints associated with active noise cancelling (ANC) and the design best practices to compensate for them and maximize bandwidth.
48 Measurement of Devices That Use AGC By Adam Liberman Adam Liberman discusses the test and measurement of audio devices that feature built-in automatic gain control (AGC) and offers some advice about optimal test settings.
56 Build Your Own Oscillator This is a 1 kHz Device with Less Than 2 PPM Distortion By Dan Joffe Dan Joffe explains how to build a 1 kHz oscillator with low distortion for less than $100. IT’S ABOUT THE SOUND 8 Vinyl vs. CD (Part 2) Repeated Measurements By Ron Tipton
SOUND CONTROL 24 Reverberation: Friend or Foe? By Richard Honeycutt
Hollow-State Electronics 60 Concept Design for a Small Bass Amplifier By Richard Honeycutt