Simulation Techniques: Room Gain

Room Gain is a term not used in acoustics textbooks as such. Room acoustics is naturally often discussed in the hifi community, since the room you put your loudspeakers in will heavily influence the sound that reaches your ears, both at low and high frequencies. In these discussions the term "room gain" sometimes comes up. This article was inspired by Erik Wiederholtz (CTO of Perlisten Audio) and his interest in the topic, and he was kind enough to provide measurements and photos from his own listening room for a sealed subwoofer as well as for a vented subwoofer.

This Test Bench article characterizes a ribbon tweeter from Fountek Electronics. This company from Shanghai, with manufacturing operations located in Hefei (Anhui Province), sent its NeoPro 5i high-end ribbon tweeter, which combines a large 145mm × 15mm reinforced sandwich ribbon diaphragm with a closed-back injection-molded rear cavity, two aluminum heatsinks and a built-in transformer. This article was originally published in Voice Coil, July 2023.

The Hypex Nilai500DIY 500W Mono Power Amplifier Kit is new DIY benchmark from the company's dedicated DIYClassD brand. The kit is specified to deliver 500W with 1% THD at 4 ohms, improves output noise and idle losses significantly, and comes with a discrete buffer stage and voltage regulators. The article, originally published in July 2023, offers an extensive review with measurements of the full kit, including the PS500 DIY power supply and DIYClassD preamplifier kit.

audioXpress interviewed Rémi Guastavino, Director of Product Management at GRAS Sound & Vibration, to uncover the details of the new EQset measurement microphone series. This important innovation in measurement microphones is directly targeted at production lines and allows users to reduce spread in specifications compared to what's possible with more traditional microphones. Learn about the story of the development and the series' first product on the market. This article was originally published in audioXpress, July 2023.

Linkplay Technology is recognized for its widely adopted wireless audio streaming modules, smart home, and connected AI products. The new WiiM Pro is a versatile music streamer that combines all the latest technologies and protocols, making it the ultimate (and most affordable) home audio hub available. audioxpress received a pre-launch unit to review subjectively and objectively. This article was originally published in audioXpress, July 2023.

Another issue of the indispensable Periodical for the Loudspeaker Industry, Voice Coil July 2023 offers the first part of a loudspeaker design tutorial by Peter Larsen. James Croft reviews two patents from Resonado. And serving a generous dose of Test Bench, Vance Dickason characterizes the SB29SDNC-C000-4 29mm cloth dome tweeter from SB Acoustics, the M25 mkII 1" silk dome tweeter from Stereo Integrity, and the NeoPro 5i ribbon tweeter from Fountek Electronics.

audioXpress July 2023 provides an updated market and technology overview of Audio Amplifiers, includes the review of the Hypex Nilai500DIY 500W Power Amplifier Kits, a visit to Dutch company Grimm Audio, and an interview with Rémi Guastavino to discuss the new GRAS EQset measurement microphone series. Plus a review of the new WiiM Pro Music Streaming System, a new article series about Bass Reflex speaker performance, and a lot more.