Allowing for speaker in box size calcs

oublie · 30th September 2011, 12:09 PM

Hi,

How do you allow for driver size when calculating the box size is it just a case of roughly measuring the size of the magnet etc. or is there a cleverer way to do it?

Keriwena · 30th September 2011, 06:03 PM

I found some advice for this here:

http://www.mh-audio.nl/downloads/Read-Measuring-tsp.pdf
(scroll down to 3.4.3)

I used the 'first method' when building my test box, and bought a box of Trix (a round puffed corn breakfast cereal) to avoid weighting down the cone too much. For cones smaller than 12", you might want something smaller, as smaller bits would be more accurate.

For the speaker boxes themselves, I ignore it as it's only an error of about .04%. Again, with smaller boxes, it may be a greater concern.

oublie · 30th September 2011, 07:44 PM

Eureka!

Thanks Keriwena should have remembered that

Brett · 1st October 2011, 08:24 AM

It's simply not that critical. Many drivers have it on their datasheets as 'driver displacement' or something similar. If you see one for a driver of about the same size, use that or scale up/down slightly as approriate.

30th September 2011, 12:09 PM	#1
oublie diyAudio Member Join Date: May 2009 Location: Northern Ireland	Allowing for speaker in box size calcs Hi, How do you allow for driver size when calculating the box size is it just a case of roughly measuring the size of the magnet etc. or is there a cleverer way to do it? __________________ There are 10 types of people in the world: Those who understand binary, and those who don't...

30th September 2011, 07:44 PM	#3
oublie diyAudio Member Join Date: May 2009 Location: Northern Ireland	Eureka! Thanks Keriwena should have remembered that __________________ There are 10 types of people in the world: Those who understand binary, and those who don't...

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30th September 2011, 06:03 PM	#2
Keriwena diyAudio Member Join Date: Feb 2010 Location: in half space	I found some advice for this here: http://www.mh-audio.nl/downloads/Read-Measuring-tsp.pdf (scroll down to 3.4.3) I used the 'first method' when building my test box, and bought a box of Trix (a round puffed corn breakfast cereal) to avoid weighting down the cone too much. For cones smaller than 12", you might want something smaller, as smaller bits would be more accurate. For the speaker boxes themselves, I ignore it as it's only an error of about .04%. Again, with smaller boxes, it may be a greater concern.

1st October 2011, 08:24 AM	#4
Brett diyAudio Member Join Date: Jan 2002	It's simply not that critical. Many drivers have it on their datasheets as 'driver displacement' or something similar. If you see one for a driver of about the same size, use that or scale up/down slightly as approriate.

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