View Full Version : what port length for a HC12...i failed physics...

05-30-2004, 01:06 AM
alright....i want loud SQ. RE suggested a 1.9 cuft enclosure. i wanna build a box myself (or try to) but don't know how to do all of the calulations...

i think i want to tune it at about 28Hz

30in x 14in x 9in with a slotted port on the side is what i was thinking for the box

question is...how long does the port need to be to tune it to 28hz. also open to suggestions but i would like to keep it around those dimensions...or smaller.

05-30-2004, 04:25 AM
Where Av is the cross-sectional area of the port (in square inches),
Lv is the length of the port (in inches)
and Vb is the enlcosure's net volume (in cubic inches).

not really physics, just some math

05-30-2004, 07:24 AM
and whats the Fb stands for ?

05-31-2004, 03:56 AM
the Frequency of the box...