In this issue

8 Achieving Frictionless Lower-Power Application Connectivity with Data-Over-Sound
By Dr. Adib Mehrabi
This article explores how data-over-sound can be realized in embedded scenarios, and how Chirp’s new technology, using the Arm Cortex-M4 and Cortex-M7 processors, can be implemented by third-party engineers in their connected products.

15 The NXP NXH3670 Enables Ideal Wireless Headset Experiences

16 Benchmark HPA4 Headpone/Line Amplifier
By Gary Galo
The Benchmark HPA4 is a reference headphone/line amplifier designed to deliver amplification of analog sources for audio enthusiasts, mixing and mastering engineers, and music aficionados in homes, recording studios, and mastering suites.

26 Hooke Verse Bluetooth
Binaural Recording Headphones
By Luke McCready
Luke McCready tests the Hooke Verse, part Bluetooth headphones and part wireless binaural recording device.

38 Two Mu Valve Topologies
By Christopher Paul
The story of MU circuits, which he describes as being among the more interesting simple hollow-state voltage amplifiers.

50 A High-Voltage Delay for Tube Amplifiers - The Sequel
By Jan Didden
A modern update on his original high-voltage delay design, which he built to complement tube amplifiers.

54 The Tenacious Bass-8
Powered Subwoofer
By Thomas Zarbo, Jr.

32 Is Your Neighborhood Acoustically Friendly?
By Richard Honeycutt

36 Can Audio Experts Learn from High-Speed Amplifier Developments?
By Michael Steffes

46 Introducing Aurora
Open-Source DSP An Interview with Raphael Knoop of Auverdion
By Shannon Becker

62 The Hammond Growl
By Richard HoneycuttI

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