another port question

[bigkevy]

hello,

i have really a beginner question. how do you determine the hertz of a port? like 30 hertz vs 40 or 50 hertz? and like if im looking at a speaker on the internet is there a way to tell the port size or do i need the manual in front of me?

[Sanitarium]

there's rules of thumb for port sizes, based on box sizes, rules of thumb for box sizes based on driver sizes and google port calculator or get torres box calculator herr on smd.