Originally Posted by petew
My (noob) understanding is that polyfill increases the apparent volume of the cabinet, is that correct?
Originally Posted by Mpray1983
I have heard it described as fooling the enclosure into thinkin that the driver is actually in a larger enclosure.
Here's my understanding of the phenomenon:
So you have all these little fibers in the box, and those fibers have a lot of contact with one another. Energy is applied, and that energy results in air movement inside to enclosure. Those fibers move with the air, rubbing against one another, producing friction.
Friction produces heat. Since energy is always conserved, that heat has to come from somewhere, right? Whatever heat is produced represents energy taken from the movement air inside the enclosure, and this transfer of energy from motion to heat is the Q change of the enclosure.