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Old 8th March 2011, 05:26 PM   #11
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OK it's clearer now (sometimes understanding every word in english is not so easy...i'm french
Thanks scottmoose !

Last edited by mahleriana; 8th March 2011 at 05:32 PM.
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Old 9th March 2011, 01:31 PM   #12
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Wouldn't it be possible to simplify the Pensils even further by simply leaving out the bottom of the box, raising the speaker a bit from the floor with small feet to get the same "port" area?
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Old 10th March 2011, 05:32 AM   #13
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In case anyone was confused, my suggestion was exactly what is illustrated in the article in this thread: Rex Baldock Trike (Voigt pipes) HFN&RR 1961.
So I guess my question is essentially does the port in have directionality that is advantageous and is any passive radiator/air plug, like a regular BR, taking place in the shallow port?
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Old 10th March 2011, 05:43 AM   #14
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In theory that should work... the vent height would be about ~4.23mm. You'd have to shorten the internal box heght and you;d have to space it off something solid.

You would have a dramatically higher vent aspect ratio which will effectively add an R to the vent and change the nature of the tuning.

dave
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Old 10th March 2011, 06:55 AM   #15
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Quote:
Originally Posted by planet10 View Post
In theory that should work... the vent height would be about ~4.23mm. You'd have to shorten the internal box heght and you;d have to space it off something solid.

You would have a dramatically higher vent aspect ratio which will effectively add an R to the vent and change the nature of the tuning.

dave
You mean I get some reflex loading, even with such a very long port? It didn't seem Rex needed shorter pipes. On the contrary his was quite long plus the halfway-pipe. But then he only had empirical observations to rely on...
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Old 10th March 2011, 07:24 AM   #16
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The vent is the restricted terminus of the transmission line. Rex's design is something completely different

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Old 10th March 2011, 08:50 AM   #17
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Quote:
Originally Posted by planet10 View Post
The vent is the restricted terminus of the transmission line. Rex's design is something completely different

dave
They are? They seem quite similar to me. Both are lines, only with different amounts of taper. Rex's might not be calculated in hight to resonate at some specific opportune frequency, but it will still resonate and it still has a smaller terminus than the cross-section of the end of the line (in the article he says 40 percent smaller).

Last edited by Squeak; 10th March 2011 at 08:53 AM.
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