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Old 16th August 2010, 02:36 PM   #1
jlsem is offline jlsem  United States
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Default Rock Wool Equivalent Volume

Anyone have an idea how much I will have to adjust the volume of my speaker box to compensate for adding some of this product?

Roxul Acoustical Fire Batts Mineral Wool 2 inch Case of 6

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Old 16th August 2010, 03:22 PM   #2
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Maybe this could be of some help:

Make A Small Box Act Like A Larger One With Polyester Fiberfill By TOM NOUSAINE

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Old 16th August 2010, 04:17 PM   #3
jlsem is offline jlsem  United States
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I'm using the rock wool to damp the inner walls of a bass cabinet. I'm assuming that the relationship of the equivalent volume between this batting and air isn't 1:1.

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Old 16th August 2010, 05:20 PM   #4
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Take the rock wool and squish it with your thumb and finger down
As thin as it will go then take that compressed thickness say it's
a 1/2" and times that by the square footage of all the roxul in the
cab and that is the approx. volume.
JEREMY M_________________________________
I like it loud, BUT NOT TOO LOUD!.... Hey do you hear that high pitched ringing sound ?
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Old 17th August 2010, 03:30 AM   #5
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From one of the Richard Small's papers on loudspeaker design (the "Closed Box" paper I believe) he gives an estimate of about +15% volume for firberglass in a fully stuffed box. Starting with this estimate I always took dacron batting to be about 10% and long fible wool to be in the 20% range. Of course these are estimates.

Just lining the walls will not make a difference in the apparent box volume. The mechinism at work here is the stuffing absorbs energy from the rear radiation of the driver in the box. This effectively increases the apparent compliance of the air in the box making the box "look" bigger to the driver.
Rodd Yamashita
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