Noob Question...Sub Displacement

[SQL4Life 10+ year member]

looking at this spec sheet for the rsd 12 inch i don't see where it says sub displacement...Im trying to build a box and so i need to subtract the cubic feet by the sub displacement correct?

Is it VAS ( it says .09405 cu M)?

what is the term for sub displacement??

thanks!

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[SQL4Life 10+ year member]

http://www.bcae1.com/spboxnew2.htm

this website said u can approximate for a regular 12 inch woofer by subtracting .07...does that sound about right?

 

[miker 5,000+ posts]

Sounds about right... R's are .071... They are a pretty good size too..

 

[nismos14 5,000+ posts]

That should roughly do it.

 

[BrianChia 10+ year member]

It's not VAS. Vas is the suspension compliance equivalent air volume. If it's not specified 0.07-0.1 is a good estimate for a 12".

 

[IgnoreMe 5,000+ posts]

looking at this spec sheet for the rsd 12 inch i don't see where it says sub displacement...Im trying to build a box and so i need to subtract the cubic feet by the sub displacement correct?
Is it VAS ( it says .09405 cu M)?

what is the term for sub displacement??

thanks!

i wouldnt worry about it. it wont effect your tuning (ported) or even a sealed box. its like a 4.0 cube box, versus a 4.07.

but yes, most 12's average around .07 (less than 1/10th of a cubic foot)

 

[SQL4Life 10+ year member]

yeah i decided with the .07...too bad did'nt have time to finish the box today