Newbie Question on Driver Ratings

6f6 · 14th January 2007, 08:55 PM

To Veteran Loudspeaker Builders,
Does the Vas rating in drivers take into account the actual volume of air that the woofer occupies in the box?
For example, supposing my (imaginary) woofer had a Vas of 1 cubic foot for a Qts of .7, could I just construct a box with 1 cubic foot of interior volume (such as 12in x 12in x12in)? Or would I have to make adjustments for the volume that the cone and magnet occupies?( And no, I would never use a cube.)

6f6 · 14th January 2007, 09:05 PM

Allow me to simplify the question. Do I have to add volume to account for the volume occupied by the speaker?

Pit Hinder · 14th January 2007, 11:43 PM

6f6,
don't trust anybody who ain't family - ain't that what your mother taught you? Don't EVER trust factory specs, as they'll never reveal how their tame engineer (hating himself) had to cook the books.

The pair of drivers you have migtht be far from the honorably measured ones anyway - go for it and make sure.

Pit

pinkmouse · 14th January 2007, 11:58 PM

Quote:

Originally posted by 6f6
Or would I have to make adjustments for the volume that the cone and magnet occupies?

Yes.

14th January 2007, 08:55 PM	#1
6f6 diyAudio Member Join Date: Oct 2006	Newbie Question on Driver Ratings To Veteran Loudspeaker Builders, Does the Vas rating in drivers take into account the actual volume of air that the woofer occupies in the box? For example, supposing my (imaginary) woofer had a Vas of 1 cubic foot for a Qts of .7, could I just construct a box with 1 cubic foot of interior volume (such as 12in x 12in x12in)? Or would I have to make adjustments for the volume that the cone and magnet occupies?( And no, I would never use a cube.)

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14th January 2007, 09:05 PM	#2
6f6 diyAudio Member Join Date: Oct 2006	Allow me to simplify the question. Do I have to add volume to account for the volume occupied by the speaker?

14th January 2007, 11:43 PM	#3
Pit Hinder diyAudio Member Join Date: Nov 2006 Location: Hannover, Germany	6f6, don't trust anybody who ain't family - ain't that what your mother taught you? Don't EVER trust factory specs, as they'll never reveal how their tame engineer (hating himself) had to cook the books. The pair of drivers you have migtht be far from the honorably measured ones anyway - go for it and make sure. Pit

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