In this issue

8 Modulation Distortion in Loudspeakers and Its Detectability (Part 1)
An Introduction to Doppler Distortion
By Richard Honeycutt

14 Examining Fundamental Amplifier Techniques with Electron Tubes, 2nd Edition
By Richard Honeycutt
Reviews the second and more extensive edition of this electronics classic, giving high marks for its useful information about electron tube technology and tube audio amplifiers.

16 Energy-Efficient Multi-Level Amplifier Solutions
By Ward Maas
This article takes a closer look at a new generation of energy-efficient integrated Class-D amplifier solutions developed by Merus Audio, recently acquired by Infineon Technologies.

24 HDMI Specification 2.1 Improves Home Theater Audio with eARC
By Marshall Goldberg

28 Thoughts on AES X223 and X241 Speaker Measurement Projects
By Geoff Hill
The Audio Engineering Society (AES) is working to develop industry standards, focusing on measurements of loudspeaker drive units. Learn more about the quest.

34 The Incredible Egg (Part 1)
Sound Reproduction at Its Best
By Thomas Perazella
This three-way design features the latest generation of SB Acoustics’ high-end Satori drivers and two Dayton 12” woofers in a separate sealed box base.

42 A Modified Version of the Bullhorn Speaker System
By Ken Bird
In this article, he details how you can make your own set of these modified “Bullhorn” speakers.

48 The Brioso Speakers
Lively Two-Way Speakers with Transmission-Line Bass
By Paul Kittinger
The Brioso (Italian for lively) uses a Scan-Speak Revelator midwoofer and a Transducer Labs Alumina ceramic dome tweeter in a floor-standing, mass-loaded transmission line enclosure (ML-TL). Learn how to make these award-winning speakers for yourself.

HDMI Specification 2.1 Improves Home Theater Audio With eARC

The new HDMI standard adds a unique feature to preserve AVR compatibility. In this article, Marshall Goldberg explains how Enhanced Audio Return Channel (eARC) works.

6 mins

​​​​​​​Thoughts On AES X223 And X241 Speaker Measurement Projects

I have just returned from the recent Audio Engineering Society (AES) 144th International Convention in Milan, Italy, where I was among many colleagues who are trying to solve one of the outstanding problems of loudspeaker drive units today. Namely, being able to trust the measurements that are being presented to us.

9 mins

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