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-   -   Anyone used Scan-Speak's "Flow Resistors" or "Aperiodic Vents"? (

Ignite 17th November 2001 10:35 PM

I've read of a few times these have been used and I have a set of old bookshelf speakers that use "aperiodic vents". Scan-Speak makes them under the title of "Flow Resistor" vents. I'm looking to reduce the needed size of a large sealed subwoofer design with them. The websites selling them are pretty vauge though. Has anyone worked with them?

Hedlund 18th November 2001 05:31 AM

Yes, I have used them in three projects with nice result.
You can reduce the size of the box a little bit, like 20-25% and still have the same performance but you can't half the volume or something like that.

The best thing they do however is to lower the resonance peak, which gives a over-all better bass.
In 3-way design this also make crossover design easier.

The best results I have got have been with drivers that have a Qts around 0,45-0,5, and a Rf/Qes ratio of 50-60.


walker 18th November 2001 07:58 AM

Janne, they sound similar to Dynaudio's variovents, are they?
Regards WALKER

Hedlund 18th November 2001 08:42 AM

Yes, they are about the same, just a little bit different "flow resistance".


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