Ported Box Size Based on Vas - Page 2 - AVS Forum
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post #31 of 39 Old 11-13-2013, 01:32 AM
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i'd go for the large slot port, but if going round, i'd probably take off a little, perhaps 10-15% what winisd indicates. with a 20hz target, it won't matter if you come in at 19 or 21hz. you'll never know the difference, so don't be too concerned about messing it up.
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post #32 of 39 Old 11-13-2013, 01:57 AM - Thread Starter
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Thanks LTD. Does winisd account for Vd in the suggested box volume? And is Vd the displaced volume of air or is it the volume of the basket and magnet inside the box?

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post #33 of 39 Old 11-13-2013, 02:01 AM
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it is net after everything.

you have to subtract for the volume of the driver, bracing, and port(s).

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post #34 of 39 Old 11-13-2013, 02:14 AM - Thread Starter
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If it is net volume, shouldn't we add the volume of the driver, bracing, and port(s)? 

 

Is Vd displaced volume of air or is it the physical volume of the cone/basket/magnet inside the box?

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post #35 of 39 Old 11-13-2013, 12:33 PM
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Quote:
Originally Posted by Searching4Bass View Post

If it is net volume, shouldn't we add the volume of the driver, bracing, and port(s)? 

That would be gross/total volume.

Is Vd displaced volume of air or is it the physical volume of the cone/basket/magnet inside the box?

I believe Vd is the amount of air displaced by the cone.
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post #36 of 39 Old 11-13-2013, 05:23 PM
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volume displaced is typically in reference to how much air the driver can move, NOT how much space the driver takes up inside the enclosure. I was assuming that you were talking about the amount of space the driver takes up inside the enclosure.

so, just to put it another way:

exterior volume - exterior panels = gross interior volume

gross interior volume - driver - bracing - ports = net interior volume.

net interior volume is the number winisd uses.

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post #37 of 39 Old 11-13-2013, 09:26 PM - Thread Starter
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LTD I understand what net and gross mean but the way you are describing confuses me. let's say winisd suggests 100 ltrs net internal box volume and bracing/Vd/port take up collectively 15 ltrs. so, shouldn't the gross internal volume be 115 ltrs and i should build the box to 115 ltrs? coz when we minus the volume taken up by bracing/Vd/port (15 ltrs), the net is still 100 ltrs which is what winisd suggested.

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post #38 of 39 Old 11-13-2013, 09:33 PM
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"LTD I understand what net and gross mean but the way you are describing confuses me. let's say winisd suggests 100 ltrs net internal box volume and bracing/Vd/port take up collectively 15 ltrs. so, shouldn't the gross internal volume be 115 ltrs and i should build the box to 115 ltrs? coz when we minus the volume taken up by bracing/Vd/port (15 ltrs), the net is still 100 ltrs which is what winisd suggested."

you've got it.

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post #39 of 39 Old 11-13-2013, 09:42 PM - Thread Starter
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thank you

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