Test Bench: The T-25M 1" Dome Tweeter from Beyma’s New NMF Series

Vance Dickason received two of the latest products to come out of the R&D labs of Acustica Beyma, the Spanish pro sound OEM transducer manufacturer, which celebrated 50 years in 2019. This review focuses on the T-25M NFM 1" aluminum/magnesium alloy metal dome tweeter. Specifications detail a 20W AES power handling, recommended crossover frequency of 2.5kHz (with a 12dB/octave high-pass filter), and 88dB at 2.83V/1m sensitivity. This article was originally published in Voice Coil, December 2022.

GRAS introduced a new technology aimed at increasing efficiency and improving test accuracy in the consumer audio and telecom space. The new GRAS EQset Microphone technology is a new advancement that guarantees fixed sensitivity and a flat response curve across all frequencies in every EQset-enabled microphone. Essentially the new EQset technology introduces an equalized microphone, with a flat response curve and uniform fixed gain out of the box, vastly reducing the risk of measurement errors.

In this article, Zami Schwartzman shares his personal journey to design and perfect his own accelerometer-based motion feedback desktop subwoofers, including plate amplifiers with MFB control, crossover and voice coil thermal protection that can be matched with any low frequency MFB driver. The proof of concept demonstrated the ability to perfectly complement popular active nearfield monitors, mitigating the effects of room reflection. This article was originally published in audioXpress, September 2022.

Many product designers and manufacturers in the audio industry the world over have been making huge leaps forward in hardware, software, and interoperability that they have been largely unable to show off thanks to a disruption to live events. Following the return of trade shows in 2022, the lid has been lifted on a whole host of innovations in the pro audio space, and among them Holoplot has emerged as a standout with its X1 Matrix Array sound system. This is an inside account about how the Holoplot team has been pushing the boundaries of what is possible in the pro audio space.

This article offers a valuable inside perspective about developing new diffuser solutions, and lessons learned while designing countless critical listening rooms around the world. A journey that lead to the creation of the PolyFlex diffuser, which will scatter either horizontally or vertically, depending on the orientation, and improve clarity in speech and spatial focus without making a room sound dead and/or small. The author was actively involved in multiple acoustics standards committees, including for testing procedures.

GRAS Sound & Vibration, part of Axiometrix Solutions, is implementing a trade-in offer to replace old measurement microphones with new high-quality GRAS microphones. For a limited time, any measurement microphones can be traded-in to GRAS 46AE range microphones with a 35% discount. This includes the GRAS 246AE with SysCheck2, which is a perfect combination with an Audio Precision analyzer such as APx517, or the APx1701 test interface.

Responding to increased demand, Amphion Loudspeakers has announced the opening of their new headquarters in Kuopio, Finland. The 19,000 square foot facility increases manufacturing and stock space, includes a purpose-designed R&D rooms, and demo areas for the brand’s home and studio lines of monitoring. This is a major upgrade from Amphion’s previous offices and represents a sizable investment in the brand’s future.

Klippel has released a new software update for the Klippel Analyzer System with various new features for both R&D and QC applications. The most important updates include an improved Time Frequency Analysis (TFA) module, the official release for the QC 3D Spectrogram Limits (3DL) optional module for Quality Control (QC) testing, while adding Impedance (IMP) for T/S parameter testing and Motor + Suspension Check (MSC) tasks, among other features, to the QC Stand-alone software. The update is free of charge for all users running dB-Lab 212 or QC7.

This article, written by Al Clark (CEO, Danville Signal Processing), tells the story of his company’s R&D journey into the development of the dspNexus DSP Audio Processor. An interesting perspective about how the author’s experience led him to maximize the possibilities of digital audio, resulting in successfully bringing to market a dedicated DSP audio processor that could be used as a control center, a preamplifier, and a DSP engine for powered loudspeaker applications. This article was originally published in audioXpress, November 2021.

The Vitec Group, an international conglomerate of hardware products and software solutions for content creation, announced that it completed the acquisition of Audix, the microphone manufacturer from Portland, Oregon, which in the past three years has successfully executed the most ambitious product catalog expansion in its history. With the acquisition, The Vitec Group expands its audio hardware business established with the 2018 acquisition of Rycote, the manufacturer of advanced microphone windshields and suspension systems.