Koss Reinvents Iconic Koss Porta Pro Next-Generation Wireless Headphones

Koss Corporation, the US headphones manufacturer and the creator of the world's first SP3 Stereophone in 1958, is celebrating the 40th Anniversary of the Koss Porta Pro with the introduction of the next-generation Koss Porta Pro Wireless headphones. The iconic Koss Porta Pro headphones now combine the legendary sound and the design of the Koss Porta Pro Classic, with the convenience and freedom of Bluetooth 5.2 wireless, also supporting wired USB-C connectivity.

For more than 30 years, the Sennheiser HD 25 headphones have been the professionals' choice for monitoring, field recording and DJing - as well as the favorite "light" headphones for many music enthusiasts. Now Sennheiser is launching an all-new HD 25 LIGHT model, which for the first time combines the sound signature of the original on-ear with a simpler headband design. By offering the same sought-after sound performance as the iconic classic, the new model provides an attractive entry into the HD 25 world.

As promised when the company did its first public appearance in 2019, Austrian Audio is now launching the HI-X (High Excursion) professional headphones. Known until now for the OC818 and OC18 microphones for studio and live use, Austrian Audio introduced its new headphone range, designed and constructed in Vienna and made in Austria. At NAMM 2020, Austrian Audio debuted the on-ear HI-X50 and the over-ear HI-X55 headphones.

Christopher J. Struck (CJS Labs) discusses all options available for headphone testing and calibration. The article discusses what should be included in a complete headphone test system, considerations on electrical impedance, considerations on repeatability of the results, free and diffuse field corrected responses, left-right tracking, and the use of two-tone distortion measurements. Reference reading material. This article was originally published in Voice Coil, July 2019.

Lifestyle headphone brand, Master & Dynamic announced its latest wireless headphones, featuring custom beryllium drivers. According to the New York City-based company, the new MW50 Wireless On-Ear Headphones were designed as a portable alternative made to last, combining the finest materials and rich, warm sound, with comfortable ear cups that fold flat. The “form-meets-function” exposed all-aluminum antenna provides best-in-class Bluetooth signal range, while the new design is one-third lighter than the company’s previous MW60 model.

In this article, Steve Temme discusses the issues that are common to testing all types of headphones. As more and more loudspeaker engineers find themselves employed in the fast-growing headphone market, it is important that the unique challenges of testing headphone packages are fully understood.