i was reading a build thread on here the other day, and the port calculations really confused me. everything i've ever heard/read has been that in order to keep the same tuning frequency, when adding more port area, you have to lengthen the port. but what i read the other day was a port with a pretty large port area (~100 sq inches, i think) and a length of like 3". and the guy claimed it was tuned to like 32-35 Hz.
the box i'm planning on building i have like 20 inches^2 of port area, and a length of like 28". and it's tuned at just under 32 Hz.
can anyone clarify this for me/re-explain something that i might have missed?