Get Ready for What’s Coming with audioXpress January 2017!

audioXpress January 2017 is now available. This month, we review Kii Audio’s new Kii Three speakers, and report on the most interesting new products at The Rocky Mountain Audio Fest (RMAF) 2016. We explore Near Field Magnetic Induction (NFMI) wireless audio applications, and the new USB Audio Device Class 3.0 specification for USB Type-C. We discuss streaming DSD over the Internet, revisit the Helmholtz resonator, explain how to build a Low-Power, Class-A Power Amplifier, and interview Michael Carnes of Exponential Audio. There is a lot to read inside this issue!

Here is a simple portable device from George Ntanavaras that can help answer the question about peak voltage and peak current requirements and whether or not your power amplifier is capable of driving your loudspeaker without clipping. This article was originally published in audioXpress March 2015 — Focus on Test & Measurement Edition. (Updated Dec 2015)

For our March 2015 edition, we have selected a series of articles dedicated to Test & Measurement, both from a practical and a DIY perspective. First is Ethan Winer’s (re)take on Practical Applications for SPL Meters, followed by an historical recap from Voice Coil magazine editor Vance Dickason, on his reputed Test Bench process used to characterize drivers. We also discuss Headphone Testing issues among other things.

A design based on superior op-amps used in audio applications. A high-quality amplifier must drive high-quality headphones. This article describes the design and construction of a high-quality, high-power headphone amplifier.

In this article, George Ntanavaras describes the design and operation of a system consisting of the ACH-01 accelerometer and a preamplifier with an integrated analog signal processor. With this system, it will be possible to measure at the low frequencies the acceleration, the velocity, and the excursion of a loudspeaker cone. Also the panel vibrations of a loudspeaker cabinet will be very easily obtained. Originally published on audioXpress June 2011.