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Old 25th November 2021, 04:37 AM   #21
Nikolas Ojala is offline Nikolas Ojala  Finland
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Thumbs up Empirical formula is OK

Quote:
Originally Posted by Galu View Post

If you wish to experiment, there is an empirical formula for calculating the total area of the resistive vent.

A = 5.5 x V [0.818 (Fs/25) + 0.182]

Where A is the resistive vent area in sq in, V is the enclosure volume in cu ft and Fs is the resonant frequency, in Hz, of the driver in free air.
Thanks!

I don't have any problem with the fact that the formula is empirical. Did you find that formula from some other source or did you discover it by your own experiments?
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Old 25th November 2021, 11:15 AM   #22
Galu is online now Galu  Scotland
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The formula is from an article by Steve Hutton published in the December 1974 issue of Hi-Fi News & Record Review.
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Old 25th November 2021, 07:40 PM   #23
Galu is online now Galu  Scotland
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During the 1960s, and continuing into the 1970s and 80s, a great many DIY speaker designs were published in the UK hi-fi press.

One of the DIY designs which appeared in Hi-Fi News was Steve Hutton's “Inexpensive Reflex Speaker” (December 1971) - so he did have some experience in the field.
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Old 26th November 2021, 04:09 AM   #24
IG81 is offline IG81  Canada
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Here's a pair of Philips AD7060/M8 in aperiodic enclosures I built in 2010. The vent was glasswool sandwiched between guttermesh.

AD7060_a.jpg

Here's the impedance sweep of an aperiodic mid-TL I made for a Fostex FF85WK. I did not implement this into a build, but did it for fun as well as to learn.

FF85WK_tube_polyfill_dense.PNG
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