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18 Big Promises in Large and Small Parameters By J. Martins and Mike Klasco In this Market Update, we address new trends in drivers and transducers, from new diaphragm materials for loudspeakers to woofers, tweeters, and compression drivers to microspeakers and drivers for headphones. 8 2019 COMSOL Conference Boston One Workflow to Rule Them All 32 Measuring Amplifier Harmonic Distortion - Below -140 dBc 34 Cambridge Audio Edge W Power Amplifier - Amplification to Live With 39 The Measurements By Stuart Yaniger Tested Cambridge Audio’s Edge series power amplifier, the Edge W. audioXpress submitted this design, which claimed to be the culmination of the brand’s audio engineering expertise, to extensive listening and measurement sessions. 44 Practical Testing of Voice-Controlled Audio Devices This article discusses tools and techniques that are available to accurately measure the audio performance of voice-controlled and connected devices under the many various real-world conditions they may be used. 56 A Class D HAT for Raspberry Pi Learn more about this new affordable high-end 2 x 40 W Class D audio amplifier in a Hardware Attached on Top (HAT) board to connect onto a Raspberry Pi Zero platform, creating a solution ideally suited for development and DIY audio projects. 59 An Essential Piece of Equipment for the Audio Enthusiast - Heavy-Duty Dumby Load 62 Repairing the Oldies

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