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hey...i think i found a partial answer to another question i raised in here...
read from the part it says about "for passive systems"....
Tuning Fq: The tuning frequencies specifying the actual tuning frequency of the system. For ported systems, this only depends on the port length, port area and volume of the box. For passive systems this only depends on the compliance, mass and surface area of the radiator(s) and the volume of the box. Increasing the number or size of the passive radiator(s) is like increasing the size of the port(s) and will allow for more output at tuning frequency.
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