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SQL4Life
12-25-2007, 03:36 PM
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!

SQL4Life
12-25-2007, 03:59 PM
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
12-25-2007, 04:19 PM
Sounds about right... R's are .071... They are a pretty good size too..

nismos14
12-25-2007, 04:33 PM
That should roughly do it.

BrianChia
12-25-2007, 06:07 PM
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
12-25-2007, 06:22 PM
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
12-26-2007, 12:36 AM
yeah i decided with the .07...too bad did'nt have time to finish the box today