Speaker Builder: Open-Baffle Subwoofer Simulation with Akabak

Confronted with the impossibility to conduct reliable measurements in the low-frequency domain for his DIY speaker project, George Ntanavaras explores the alternative of relying solely on simulation software. To validate the design of an open-baffle subwoofer using the AKABAK software, created by German company R&D Team, he also explores the transition from measurements to simulation. His experiments contrast the near-field response measurements of his loudspeaker with the accuracy of the simulation using AKABAK.

More than 150,000 copies in print and acclaimed as the loudspeaker engineering "bible," Vance Dickason's Loudspeaker Design Cookbook celebrates 46 Years with an expanded 8th Edition. Vance Dickason explains what is new in this much expanded edition, published in color for the first time, and available softbound or hardbound.

DIY audio pioneer and author David B. Weems passed away on April 4, 2021 at his Newtonia Missouri home after a short illness. Mr. Weems is known to many in the speaker design and building community for his prolific authorship of DIY books, and articles for such publications as Audio, Popular Electronics, Radio Electronics, Audio Amateur, Speaker Builder, and AudioXpress.

Celebrating 50 years of The Audio Amateur - the publishing company that started it all for us - and 20 years of audioXpress, we begin 2021 with a great - and expanded - edition. We discuss market and technology trends in Speakers and Transducers, a new MEMS transducer topology for wireless earbuds, and the latest innovations in haptic drivers and transducers. Perry Marshall details his unique dipoles speaker project, and renowned tube expert Menno van der Veen explains all the secrets of the latest Vanderveen Trans-SE10 amplifier. Now available in print and digital

Dayton Audio continues to expand its portfolio of wireless audio solutions with the introduction of new KAB Class D amplifier boards with Bluetooth streaming, to support any speaker build, or audio project for DIY enthusiasts or OEMs. Dayton also introduced a new updated version of one of its most popular amplifiers, with the new APA102BT Class D Stereo 60 WPC Bluetooth Amplifier, and launched the new DTA Pro, a complete amplifier with Bluetooth, USB DAC, and wireless remote control.

Ported enclosures are known to extend the low-frequency output of loudspeakers by exploiting the Helmholtz resonator effect produced by the compliance of the air inside the enclosure and inertance of the air in the port. This article looks at the problem of port nonlinearity to determine the correct port size, and the acoustic impedance of the port under high air velocity. This article was originally published in audioXpress, September 2001.

As announced during the latest ALMA International Symposium & Expo 2018 (AISE), the Association of Loudspeaker Manufacturing and Acoustics (ALMA) International is moving its annual event to InfoComm in 2019, scheduled for 9-10 June in Orlando, Florida. ALMA is now pleased to announce a key education track for the upcoming AISE2019 (ALMA International Symposium & Expo) focusing on speaker building. More education initiatives and the full program of conferences, panels and tutorials, will be confirmed soon.