Hi everyone, I'm going to build a subwoofer and while I'm waiting for the pieces I ordered I started doing a little project.
The vent tube I have chosen consists of a regular cylindrical part and 2 flares.
I was thinking of getting the diameter from the equivalent area by also calculating the flared ends:
equivalent area (including flares) = total volume / total length
It's correct?
The vent tube I have chosen consists of a regular cylindrical part and 2 flares.
I was thinking of getting the diameter from the equivalent area by also calculating the flared ends:
equivalent area (including flares) = total volume / total length
It's correct?
If the flares are a small proportion of the overall length you need, then I would ignore them and use the main cylinder diameter only.
If it will be a very short vent, then you may need to calculate an average diameter allowing for the flares.
The best option is to measure the actual tuning frequency in a prototype box (or the real one, if you can design it so that you can still get enough space to reach in and adjust port length after it is built) and adjust as needed - typically you'd cut the port a bit longer than you think you'll need, and then shorten it step by step until the desired tuning is achieved.
If it will be a very short vent, then you may need to calculate an average diameter allowing for the flares.
The best option is to measure the actual tuning frequency in a prototype box (or the real one, if you can design it so that you can still get enough space to reach in and adjust port length after it is built) and adjust as needed - typically you'd cut the port a bit longer than you think you'll need, and then shorten it step by step until the desired tuning is achieved.
Have a look at this application that should hep you design your ports
Flare-it - Free Speaker Design Software
Flare-it - Free Speaker Design Software
Many thanks for both answers.
It is my first speaker. I have little manual (and a lot of time available waiting for the pieces to arrive) and that's why I'm looking for certainties in the technical-theoretical part. Vent ends are not negligible and now I know I have to measure them. I will keep the speaker a bit bigger and the tube a little longer but I hope it will help me to know how oversized the vent is. Also Flare-it is very interesting, fortunately I have not yet ordered the reflex tube.
PS. Beautiful music in The Prophets Home | THE PROPHETS OF ZARQUON!
It is my first speaker. I have little manual (and a lot of time available waiting for the pieces to arrive) and that's why I'm looking for certainties in the technical-theoretical part. Vent ends are not negligible and now I know I have to measure them. I will keep the speaker a bit bigger and the tube a little longer but I hope it will help me to know how oversized the vent is. Also Flare-it is very interesting, fortunately I have not yet ordered the reflex tube.
PS. Beautiful music in The Prophets Home | THE PROPHETS OF ZARQUON!
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