Quick question for enclosure wizs

[Dr. Slam 10+ year member]

If the port bends you must measure down the CENTER of the port.
Easiest is to make a spreadsheet that subtracts port displacement from the volume based on the size of the port...juggle it around a bit til you have the correct tuning...though IMO if you're off by a couple inches generally you'd never notice the difference unless you're chasing 10ths.

Also worth mentioning is if it's a slot port that runs along a wall of the box you must add 1/2 the port width to length because the wall that continues after the port acts to extend the port. SO where the port ends internally, picture it forming a right triangle extending out a port width.

That's exactly the answer I needed

 

[THATpurpleKUSH 5,000+ posts]

eww dont use 12 volt.
use this: Torres' Box Tuning Calculator - SMD Forum

I have never had any trouble with the 12v compared to other calcs in win isd or psp's calc, the re audio calc is off though.