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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

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.

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?
High-order harmonics are more offensive than low.
— D.E.L. Shorter: "The Influence of High-Order Products in Non-Linear Distortion". Electronic Engineering, April 1950.
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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.


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.

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