NGA wants a global map for ambient sound

BY SUSAN MILLER APR 30, 2018 The National Geospatial-Intelligence Agency wants to map the world’s ambient sounds. The NGA Research Directorate’s Environment and Culture pod wants to “leverage new and emerging technologies to characterize spatial-temporal patterns in sounds and develop corresponding foundational geospatial datasets,” the agency said in a request for information. The same way technology … Read more

Ian Schreier’s SM57 Drum Mic seminar

https://www.youtube.com/watch?v=hC7Ed3u4UHQ   ===   The Shure SM57 is a versatile dynamic microphone that is commonly used for a variety of audio recording applications, including miking drums. While it’s not specifically designed as a drum mic, the SM57 is often employed on drums due to its durability, reliability, and ability to capture sound accurately across a … Read more

Measuring DIY Speakers — ported / sealed — insulated / not — plastic fiber concrete boxes — Room acoustics, treatments

https://www.youtube.com/watch?v=jjZHFIdfUFk   Helium gas inside enclosure.  Overall +2dB gain as speaker back-pressure is reduced.     Anechoic chamber response — blue/purple is speaker-forward facing; red is speaker-rear facing (into absorptive lining).     Ported vs Sealed.  Ported gives overall more bass output (+5dB), all other factors approximately equal.  Green is ported; blue/purple is sealed.   … Read more