On Thu, March 7, 2019 2:23 pm, Gerhard Zintel wrote: > For sure you can tune such a system to be efficient in > a small frequency range. The article mentioned "a" high pitched tone, singular article in English implying single frequency or small spread of frequency. Does not seem likely to be useful for music use, might help for machinery with a specific annoying high pitch frequency. -- Chris Caudle _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user