box size

well its 2 together actually, identical

inside demensions (for 1)
16.5 x 16.5 x 34.5

port size is 16.5 x 3, and i was told by the shop to make the port 17.25 "s deep to tune the box to 34hz, and he got that from WinISD

and then today at work AFTER building the box to those specs

i check another site, and put in the same dimensions, and its telling me to make the port 6.3" deep, with keeping the 16.5 x 3 height and width in order to tune the box to 34hz


i put the same dimensions into this other calculator that gave me the 6.3 number, and its saying my box the way it is now is tuned to 26-27 hz

its all hooked up now, it plays alright with low hz and ****ty with mid and ok with high


which calculation is right?

heres a pic of the box