Just One More Thing. Don't Miss Voice Coil December 2023

This is the last issue of Voice Coil for 2023, which includes a combination of valuable industry resources and expert knowledge for loudspeaker engineers. Mike Klasco and Nora Wong (Menlo Scientific) have compiled an updated directory of Engineering Simulation Software and Test & Measurement Hardware Vendors. And in Test Bench, Vance Dickason characterizes the latest PTT8.0X04-NAB-02 8" aluminum cone woofer from Purifi Audio.

The Audio Engineering Society Standards Committee has published an updated to the recently approved standard, AES75-2023: "AES standard for acoustics – Measuring loudspeaker maximum linear sound levels using noise." The standard, originally announced and adopted in March 2022, addresses the need for a practical and repeatable procedure for quantifying this key aspect of loudspeaker performance. The update reflects industry support from audio manufacturers, audio test and measurement manufacturers, and service providers.

Eclipse Audio has announced a major update of its FIR Designer M software tool for creating custom loudspeaker processing (IIR+FIR) filters and complete multichannel presets. Version 4 adds auditionDSP, a dynamic new digital signal processor and audio player that enables users to listen to their custom processing during the development process, rather than relying solely on visual plots. auditionDSP also allows different filtering options to be audibly compared by running processing for up to three loudspeaker presets simultaneously, in real-time, with live switching between presets.

The Audio Engineering Society announced the adoption and publication of the AES75 standard for acoustics - "Measuring loudspeaker maximum linear sound levels using noise - in March of 2022. The AES SC-04-03-A task group is currently in the process of publicizing the 2022 AES75 standard and has issued an industry appeal of support from audio manufacturers, audio test and measurement solutions manufacturers, and audio measurement services providers.

Listen is the first test and measurement company to automate measuring loudspeakers to the new AES75-2022 (M-Noise) standard for Maximum SPL. This removes subjectivity, increases reliability, and saves time. The test sequence, developed for use within the company’s popular SoundCheck audio test and measurement system, is available free of charge on Listen’s website. And Listen is now offering the new Portland Tool & Die MDT-4000 audio measurement turntable, fully controllable from within SoundCheck.

The 2022 Loudspeaker Industry Sourcebook (LIS) is now available online and print copies are on the mail! Loudspeaker Industry Sourcebook provides a comprehensive guide of manufacturers and their products and services, not only with its annual printed publication, but also with its dedicated, always-online directory available. View the 2022 edition now thanks to this year's cover sponsor: Tectonic.

Another great issue of Voice Coil magazine. Vance Dickason writes about the Multi-Tone Measurement Module (MTON) available for the Klippel KA3 Analyzer. Mike Klasco and Nora Wong (Menlo Scientific) compiled an updated Directory of Headphone Test & Measurement Equipment for 2022. We revisit a 2004 patent of a speaker using an "Internal Negative Stiffness Mechanism." And in Test Bench, Vance Dickason characterizes the latest Celestion CDX1-1412 1" Compression Driver and a new 3" dome midrange from Tang Band Speaker (TB Speaker).

More than three years past since M-Noise was proposed as a new test signal for standardized measurement of a loudspeaker system’s maximum linear output, the Audio Engineering Society has announced the adoption and publication of AES75-2022, “AES standard for acoustics - Measuring loudspeaker maximum linear sound levels using noise.” The new standard addresses the need for a practical and cohesive procedure for the prediction of loudspeaker performance.