Question considering port length

cumesoftware · 21st May 2008, 03:17 AM

When considering the port length for a vented box, does the measure refers the length from the outside of the box (the real duct legth), or the length of the part of the port that goes inward (considering a distance from the internal surface of the wall where the port is)?

sreten · 21st May 2008, 09:54 AM

Hi, the real duct length,

/sreten.

augerpro · 21st May 2008, 10:29 AM

Make sure whatever method you are using has an end correction of some sort or the box will likely be tuned too low. What is this for and what kind of stuffing or wall lining are using? Is the port flared or straight?

cumesoftware · 21st May 2008, 11:46 AM

The port is a Monacor BR-30HP. I guess that the internal diametre is constant, although it doesn't appear so. I assume that because it only specifies one internal diametre. It seems that the port is flared at one end and the walls tend to get ticker to the outside direction.

I'm not using any filling or lining.

21st May 2008, 03:17 AM	#1
cumesoftware diyAudio Member Join Date: May 2008	Question considering port length When considering the port length for a vented box, does the measure refers the length from the outside of the box (the real duct legth), or the length of the part of the port that goes inward (considering a distance from the internal surface of the wall where the port is)?

21st May 2008, 10:29 AM	#3
augerpro diyAudio Member Join Date: Aug 2006	Make sure whatever method you are using has an end correction of some sort or the box will likely be tuned too low. What is this for and what kind of stuffing or wall lining are using? Is the port flared or straight? __________________ ~Brandon DriverVault Soma Sonus Old Driver Tests

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21st May 2008, 09:54 AM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, the real duct length, /sreten.

21st May 2008, 11:46 AM	#4
cumesoftware diyAudio Member Join Date: May 2008	The port is a Monacor BR-30HP. I guess that the internal diametre is constant, although it doesn't appear so. I assume that because it only specifies one internal diametre. It seems that the port is flared at one end and the walls tend to get ticker to the outside direction. I'm not using any filling or lining.

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