The line is tapered, so it's probably LOWER than 31Hz
the line length of my current design is about 31Hz WITHOUT stuffing. The Fs of my driver is 26Hz. Is the line too long? I don't want to to be tuned below Fs when I've stuffed it
I'm just going to dive in and make one and see what happens! It can't hurt to try!
If you use a cross-sectional area that is between 2 and 3 time the driver's cone area and then mount the driver 1/5 to 1/3 of the way along the line from the closed end you will improve your chances of success.