Dont confuse him on effecting the effective volume by adding stuffing to the inside. Most people wont get it. Thats why i kept it simple.
Dr. Who anyone. lol
Well here it goes. Some of this is subjective and some is fact as speaker designing is a science but it is also a trial and error/mystery of component interaction that is highly dependant on your hearing/listening preferences. So it is a Science and an Art.
I hope I dont get bashed by the more knowledgable here.
It changes things inside the Box: increases dampening, increases thermal conversion of the internal pressure waves, reducing or changing resonances, standing wave reduction, and should help with comb filtering which is the smoothing out of the frequency response.
As far as what the driver sees. It makes the driver see the cabinet as larger due to these changes even tho it isnt so you get a lower response curve. This means better performance. Statistically this means the Q or Qts of the speaker and its resonance frequency drops. Which means for a subwoofer a lower smoother bottom end if properly done.
Too much or too little stuffing is a factor here as well as stuffing choice.
Ok enuff for me.