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8 Cutting-Edge Audio-No Wires, Room Optimized In this Market Update, we examine wireless audio and digital processing technologies, with an overview of all the latest solutions and trends in these two critical but extremely exciting domains for audio product designs. 24 Keeping the Sound (or Noise) In or Out 28 Combining Cascaded Stage Harmonic Distortion 30 Audio Precision APx555 B Series Audio Analyzer Audio Precision recently loaned us one of its newest analyzers, the APx555 B Series. Stuart Yaniger had one month to test it, and in this article he provides readers with a hint of the new expanded capabilities—both of the APx555 B Series hardware and the new APx500 5.0.1 software. 38 The xCORE VocalFusion -Speaker Linear Kit by XMOS Learn more about the VocalFusion Speaker Linear Kit, designed for those who want to integrate voice user interfaces into consumer electronics typically found at the edge of the room, such as smart home control panels and washing machines. 46 Reggie-Phil 2.0: A Current-Regulated Filament Supply Inspired by previous approaches published by audioXpress, this article explores alternative options to the design of a linear current regulator for audio tube amplifiers, including employing feedback to sense load and other design strategies. 54 Build an 18 W Single-Ended Valve Amplifier with Trans Technology This article shows an easy-to-build 18 W single-ended valve amplifier using Trans technology with pentodes, current sources, and toroidal transformers. The amplifier was created by the author to support his TubeSociety students in the Netherlands. 60 Plug-In Modifications for Hollow-State Guitar Amplifiers?

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