OK then I'm not seeing the real reasons. I was thinking the stuffing might escape from the port at high air velocities.
Stuffing turns acoustic energy into heat. This is great when you want a dead internal space (read: a sealed enclosure), but when you want to couple said acoustic energy into a resonator (whether a port or a PR), then scrubbing that energy isn't so good anymore.
Exactly right. Reflex enclosures are resonating type. Stuffing "damps" that resonance, so you loose much of the bass boost you would normally get from this type of enclosure.
I am not sure the name of the material but 3M makes it (shocker) and i like to use it as the initial layer. its typically used for being put under hardwood flooring and on top of the sub floor, one side is nice and smooth so you have a great surface for adhesives and the other side is spongy and soft. It is pretty thin, maybe 1/8th in? never measured it. You can also always double it up because of how thin it is but 1 layer is solid. Stuffing for the inside i use poly batting or hvac insulation after ripping the back off. All the expensive products targeted at the diy audio market and custom sound treatment markets are really basically the same or similar enough where you will get the same result as if you use the correct thickness or layer it enough until it is correct. Even the pyramid shaped foam treatments can be mimimicid with a little effort and egg crate mattress padding.
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