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Multi-Way Conventional loudspeakers with crossovers

Vent length question
Vent length question
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Old 19th September 2006, 10:37 AM   #1
DAMIC is offline DAMIC  Serbia
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Default 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.
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Old 19th September 2006, 10:46 AM   #2
soongsc is offline soongsc  Taiwan
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It really depends on what driver you are using and what its resonant frequency is.
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Old 19th September 2006, 12:53 PM   #3
Tyimo is offline Tyimo  Hungary
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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
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Old 19th September 2006, 01:00 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

The tube will operate as though it is slightly longer than
the shortest length, its not a good shape for good airflow.

/sreten.
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Old 20th September 2006, 06:53 AM   #5
DAMIC is offline DAMIC  Serbia
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Thank you very much for your replies.

Kind regards,
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