Volume Displacement Calculation

lovitz · 10th March 2007, 07:21 PM

How does one calculate the volume displacement of the driver in a vented enclosure?

Bassbox Pro is giving me this option, but I can't find anything on how to calculate it.

Thanks.

Svante · 10th March 2007, 10:28 PM

Quote:

Originally posted by lovitz
How does one calculate the volume displacement of the driver in a vented enclosure?

Bassbox Pro is giving me this option, but I can't find anything on how to calculate it.

Thanks.

I'm not sure I fully understans the question, but the volume displacement of the driver is always Sd*X, where X is the excursion of the cone (which is limited to Xmax).

The volume displacement of the system is larger around the helmholtz frequency, since most of the volume displacement is taken care of by the port. There is no simple formula that covers the entire frequency range for the system volume displacement as a function of driver excursion.

Cal Weldon · 10th March 2007, 10:33 PM

or are you asking how much room the driver takes up in the box?

lovitz · 10th March 2007, 11:09 PM

oh don't tell me it's that easy Cal....haha or is it?

Svante · 10th March 2007, 11:45 PM

Ah, so there is a box i bassbox to fill in the volume displacement of the driver, and you are wondering what to put there?

Ok, could be that it is the room that the driver takes... Silly me.

lovitz · 11th March 2007, 12:52 AM

I think your right. I saw volume and liters and thought it was something different.

So all I have to do is convert millimeters to liters for that value??

Thanks again guys!

10th March 2007, 07:21 PM	#1
lovitz diyAudio Member Join Date: Apr 2005 Location: Vancouver	Volume Displacement Calculation How does one calculate the volume displacement of the driver in a vented enclosure? Bassbox Pro is giving me this option, but I can't find anything on how to calculate it. Thanks.

10th March 2007, 10:33 PM	#3
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Re: Volume Displacement Calculation or are you asking how much room the driver takes up in the box? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

10th March 2007, 11:45 PM	#5
Svante diyAudio Member Join Date: Feb 2004 Location: Stockholm	Ah, so there is a box i bassbox to fill in the volume displacement of the driver, and you are wondering what to put there? Ok, could be that it is the room that the driver takes... Silly me. __________________ Simulate loudspeakers: Basta! Simulate the baffle step: The Edge

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10th March 2007, 11:09 PM	#4
lovitz diyAudio Member Join Date: Apr 2005 Location: Vancouver	oh don't tell me it's that easy Cal....haha or is it?

11th March 2007, 12:52 AM	#6
lovitz diyAudio Member Join Date: Apr 2005 Location: Vancouver	I think your right. I saw volume and liters and thought it was something different. So all I have to do is convert millimeters to liters for that value?? Thanks again guys!

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