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Nikolas Ojala
diyAudio Member

Join Date: Aug 2004
Location: Finland
Empirical formula is OK

Quote:
 Originally Posted by Galu   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?
__________________
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.

 25th November 2021, 11:15 AM #22 Galu   diyAudio Member   Join Date: Apr 2018 The formula is from an article by Steve Hutton published in the December 1974 issue of Hi-Fi News & Record Review.
 25th November 2021, 07:40 PM #23 Galu   diyAudio Member   Join Date: Apr 2018 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.
 26th November 2021, 04:09 AM #24 IG81   diyAudio Member     Join Date: Feb 2008 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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