The question is what is that math behind the suggested behaviour, which is different to the standard resonator? Why would reducing the efficiency of the port will do anything other than reduce the Q at the resonance frequency?
I don't know if this will be of assistance taken from a link posted above
"Acoustic resistance enclosure or sometimes referred to as a leaky sealed box, can be an alternative to open baffle. The acoustic resistance enclosure can be implemented with filter like material that is porous with air flow resistance. Then the ratio of acoustic resistance of the vents,
R (Ns/m^3) relative to the acoustic stiffness of the box,
K (N/m^3) will add delay,
T, where
T = R/K (s). So in theory, the out of phase acoustic AC pressure from the back of the transducer diaphragm is delayed and leaked from the enclosure such that the rear directed sound pressure is cancelled. This sometimes referred to as passive noise control. Figure 6 below contains generalized illustrations of rear and side vented acoustic resistance enclosure examples. Where
R is the acoustic resistance (Ns/m^3 or MKS rayl);
ℓ is the minimum front to back or back to front path length (m);
S is the total exit area of the vents (m^2);
Vol is the internal volume of the enclosure (m^3); and
B is the adiabatic bulk modulus of air,
142,000 (N/m^2 or Pa), then
K =
BS/Vol (N/m^3). Energy is dissipated in the vents et al.; thus the leaked radiation is attenuated and damping is increased".
In science you either experiment or calculate. We can discuss as much as you want but without mathematical representation of the suggested behaviour there’s no possible way to agree on anything. As the proof of the said behaviour is not demonstrated either there is nothing to discuss as we only have a suggestion.
There are many examples of the point ctrl is trying to make. This is why ported boxes are only minimally stuffed as a general practice and usually at the edge of the cabinet. If you stuff more you damp the resonance and lose the bass that you were trying to get with the port. Damp the resonance, lower the Q sounds very similar to me.