Wouldn't a variovent be modeled as a resistance?
(Without even mentioning damping factor.)
Ben
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They are bad enuff on mids & tweeters and on a woofer they need to deal with the resonant peak and are very large, very expensive (or electrolytic)
dave
Even MKP (I have many Aerovox MKPs), when the size is big, I think the effect is worse than normal small MKP. I have also tried some very expensive electrolytics but after listening (and waiting for break-in) I decided to avoid this series cap approach.
Snup
I don't understand the first 3 statements.
Regarding box type, I usually choose based on driver parameters and also my own requirement on size and the lowest frequency to cover. But for modeling only, of course I try all to see which one is the most suitable (And more often than not I build all types and compare)
When there's no issue with bass extension, I will usually prioritize sealed enclosure because I like the sound. Some times I need this (LR2 alignment) so I can easily add additional woofer to cover the lower bass.
Sometimes I have a need to make a smallish enclosure. That's why I tried the series capacitor loading. Stuffing the box is also helpful to achieve similar objective (but only marginally). I have also used Linkwitz Transform and similar circuits. And this "variovent" is a good idea. I have tried MANY ideas that can be considered a variovent, including the denim approach.
These days I prefer electronic approaches tho.
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