Vent length question
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 19th September 2006, 10:37 AM #1 DAMIC   diyAudio Member   Join Date: Jan 2006 Location: Beograd Vent length question I am just curious, maybe someone already asked the question, but I don't know how to search (key word). Considering bass reflex type of enclosure, dezired tuning frequency, beside all factors is dependent by the length of the vent. For example, volume of the box is 0,9 ft3 (about 25 l) vent tube is on the outside cut as usually, under angle of 90 degrees but inside the box, the other end is cut under angle. So, looking from the side the trapezoid shape is obtained. Diameter of the tube is 2 inch, upper tube length is 2.3 inch what corresponds to dezired tuning frequency of 50 Hz and other longer length is 4.42 inch corresponding to tuning frequency of 40 Hz. Well, I am wondering, what should be the final tuning frequency of the enclosure, 40Hz, 50Hz, something in the middle, or should maybe the tuning frequency be wider than usually (spread between 40 and 50Hz). Thank's in advance.
 19th September 2006, 10:46 AM #2 soongsc   diyAudio Member     Join Date: Mar 2005 Location: Taiwan It really depends on what driver you are using and what its resonant frequency is. __________________ Hear the real thing!
Tyimo
diyAudio Member

Join Date: Nov 2002
Location: Hungary
Hi!

Quote:
 Diameter of the tube is 2 inch, upper tube length is 2.3 inch what corresponds to dezired tuning frequency of 50 Hz and other longer length is 4.42 inch corresponding to tuning frequency of 40 Hz.
You have to calculate the tube's air volume and than you can model and calculate a "normal" vent tube with the same volume of air you found.
Another way: just calculate with the avarage tube lenght.

Greets:

Tyimo

 19th September 2006, 01:00 PM #4 sreten   R.I.P.   Join Date: Nov 2003 Location: Brighton UK Hi, The tube will operate as though it is slightly longer than the shortest length, its not a good shape for good airflow. /sreten.
 20th September 2006, 06:53 AM #5 DAMIC   diyAudio Member   Join Date: Jan 2006 Location: Beograd Thank you very much for your replies. Kind regards,

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