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

Ignite · 17th November 2001, 11:35 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, 06:31 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.

Janne

walker · 18th November 2001, 08:58 AM

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

Hedlund · 18th November 2001, 09:42 AM

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

Janne

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17th November 2001, 11:35 PM	#1
Ignite diyAudio Member Join Date: Jul 2001 Location: Toronto, Ontario, Canada	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?

18th November 2001, 06:31 AM	#2
Hedlund diyAudio Member Join Date: Oct 2001 Location: Alvesta, Sweden	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. Janne

18th November 2001, 08:58 AM	#3
walker diyAudio Member Join Date: Nov 2001 Location: Perth West Australia	Janne, they sound similar to Dynaudio's variovents, are they? Regards WALKER

18th November 2001, 09:42 AM	#4
Hedlund diyAudio Member Join Date: Oct 2001 Location: Alvesta, Sweden	Yes, they are about the same, just a little bit different "flow resistance". Janne

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