how do I work out this

busterno1 · 8th October 2003, 07:08 AM

could someone tell me how do I work out how much room do I allow for the port in a box.

Do I have to include the air in the port ?

because I was thinking of sealing up the ends & sticking it in a bucket of water .
Then measure what have left afterwould .
Is it allright to just fill it with water then measure that .
Thanks

daatkins · 8th October 2003, 07:56 AM

The volume of the port (including the air inside it) will take up space inside the enclosure that needs to be compensated by making the box bigger. Same applies to the drivers and crossover.

You can calculate the volume of a cylinder by....

Volume = (3.14 x radius^2) x length

If the radius and length are in centimetres then the answer will be in litres.

Nice one
David.

phase_accurate · 8th October 2003, 08:06 AM

Quote:

If the radius and length are in centimetres then the answer will be in litres.

No, this way the answer will be in millilitres ! You vave to take decimetres for the calculation in order to get litres.

Regards

Charles

Guss · 8th October 2003, 11:29 AM

Whatever your problem is, try this calculator, and if you can't find what your searching for, lol what a badluck...

calculator

daatkins · 8th October 2003, 12:04 PM

You're absolutely right, Charles. I don't know why I thought that the answer would be in litres!

Thanks,
David.

rabbitz · 8th October 2003, 04:13 PM

Just divide your answer by 1000 and it will be in litres.

1000cc=1 litre, all revheads know that.

8th October 2003, 07:08 AM	#1
busterno1 diyAudio Member Join Date: Mar 2003 Location: brisbane queensland	how do I work out this could someone tell me how do I work out how much room do I allow for the port in a box. Do I have to include the air in the port ? because I was thinking of sealing up the ends & sticking it in a bucket of water . Then measure what have left afterwould . Is it allright to just fill it with water then measure that . Thanks

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8th October 2003, 07:56 AM	#2
daatkins diyAudio Member Join Date: Aug 2001 Location: Bath, UK	The volume of the port (including the air inside it) will take up space inside the enclosure that needs to be compensated by making the box bigger. Same applies to the drivers and crossover. You can calculate the volume of a cylinder by.... Volume = (3.14 x radius^2) x length If the radius and length are in centimetres then the answer will be in litres. Nice one David.

8th October 2003, 11:29 AM	#4
Guss diyAudio Member Join Date: Jun 2003 Location: Montreal	Whatever your problem is, try this calculator, and if you can't find what your searching for, lol what a badluck... calculator

8th October 2003, 12:04 PM	#5
daatkins diyAudio Member Join Date: Aug 2001 Location: Bath, UK	You're absolutely right, Charles. I don't know why I thought that the answer would be in litres! Thanks, David.

8th October 2003, 04:13 PM	#6
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	Just divide your answer by 1000 and it will be in litres. 1000cc=1 litre, all revheads know that.

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