Schiit Audio Introduces Aegir 2 Speaker Power Amp

Schiit Audio introduced the second generation of its Aegir speaker power amp, Aegir 2, bringing its mixed voltage and current feedback Halo topology to a speaker amp for the first time. Schiit found that this topology provides significant enhancements to the original Aegir’s performance, now combined with the company's Continuity output stage which enables higher power output, less heat, and lower noise floor.

In this issue of Voice Coil, Mike Klasco shares his experience dealing with sustainability and other noble goals, an article that was greatly inspired by the effort to compile another updated Speaker Enclosure Vendor Directory for 2023. In Acoustic Patents, James Croft explains how Yamaha recently invented a clever way to use a Class-D amplifier to bend the infamous "Hofmann’s Iron Law." And Vance Dickason takes the new 10HX230 10" coaxial professional driver from Faital Pro to his Test Bench.

The February 2022 edition of audioXpress is now available and features our annual Market Update on Microphone technology. Vikrant Singh Tomar discusses TinyML and Voice Recognition Technology On the Edge, Richard Honeycutt writes about Quantification of Speech Intelligibility, and Mike Klasco expands on audio applications for Haptic Devices. George Ntanavaras builds a phono and line/headphone amplifier project, Brian Bylenok proposes a refined Current Feedback Headphone Amplifier, and Richard Honeycutt reminds us that Tube Power Amps also have Classes. Now available in print and online.

Listen to music as you (not the artist) intended. Schiit Audio announced the availability of Loki Max, a 6-band equalizer designed to meet the needs of the highest-end systems. Featuring remote control with relay potentiometers, a pure inductor-capacitor topology, and a fully discrete design with high voltage power supply, Loki Max was designed to be one of the best home listening EQs, ever - available at schiit.com for $1499.

Recently, the very existence of current feedback as opposed to voltage feedback has been called into question. This article analyzes and tests simple versions of voltage and current feedback amplifiers and demonstrates some differences in their characteristics. The article provides an excellent overview of historical terminology and how the more modern terms came about and their dependence on context. These articles were originally published in audioXpress, July and August 2018.

In this edition, learn about Habitat Soundscaping and how biophilic acoustics can cure noise in an open office, get the latest on precise low-frequency absorption, and why you should be exploring acoustic modeling software and simulation apps. Richard Honeycutt writes about sound masking, Christopher Paul explains more on current feedback amplifiers, we report on the High End 2018 show in Munich and Neville Roberts heads to Venice, Italy, to report on a unique live recording experience!

audioXpress July 2018 is one of those editions that we are certain our readers will read, revisit, and keep for reference again and again. Start with the Editor's notes about the search for a sound reference standard, read our review of Sonarworks Studio Monitor and Headphone Calibration Solution, Reference 4, and learn more about microphone choices. Next up, we interview the new owners of Creative Sound Solutions, a DIY-oriented company, and we follow up with the AXPONA 2018 show report. Gerhard Haas concludes his series on audio transformers for tube amplifiers, and Andy Lewis continues his fascinating exploration of Back EMF.

Michael Kiwanuka’s article “Current Feedback and Voltage Feedback Fallacies” (audioXpress June 2017) elicited comments from Walt Jung, with supporting signatures from a number of well-known designers, to which Kiwanuka responded. Since some editing errors have crept into the article, we decided to make available a complete correct version of the article, together with the mentioned comments and exchange.