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How measure tuning frequency of Helmholz bass trap?
How measure tuning frequency of Helmholz bass trap?
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Old 4th July 2019, 08:39 AM   #1
DrBoar is offline DrBoar  Sweden
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Default How measure tuning frequency of Helmholz bass trap?

I built some book shelfs for pocket books and got some space over at the bottom. I enclosed that and added a small port to tune it to 70 Hz. Just a nerdy thing to absorb some of the half wave resonance between floor and ceiling. Can I measure the actual tuning frequency in any way?
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Old 4th July 2019, 09:17 AM   #2
DrBoar is offline DrBoar  Sweden
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Default picture of bookshelf

Click the image to open in full size.
Below the bottom row of books there is a vented box uses as a bass trap. The back behind the books is covered with 10mm of felt.

I assume a velocity maxima in the pipe vent at tuning but how is the pressure inside? I do have microphones and signal generator.

Last edited by DrBoar; 4th July 2019 at 09:27 AM.
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Old 8th July 2019, 05:08 PM   #3
L3VY is offline L3VY  Poland
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Yes. Put microphone 1cm from port an measure. Then close port with something hard for example plywood and measure one more time with microphone in this same place.
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