which enclosure calculation method is more accurate?

[akuma4u]

hi.. i would like to know which method of calculating an enclosure is more accurate and WHY..

its between programs like torres , winisd, re box calculator, etc versus this method:

every program gives different results but i was told the method (the one in the image) where you do the actual math yourself is the most accurate.. is this true? i compared my results from using torres to this longer manual method and my results were way too far off between the two.. so far off that im thinking ONE method is seriously flawed in someway or is missing something or some kind of calculation.. anyone have any insight to this? i really like using the manual math method but i need someone to verify this is superior and more accurate to any program out there.

thanks

[Joe X]

The very best method is using sketchup software, once you find out the size of your compression chamber you subtract the driver(s) displacement and you are done, you can get port length as well, WinISD cant calculate slot ports so that one is out and all the other calculators are flawed, sketchup will be 100% accurate every time in simple projects or on any project regardless of the complexity.

You can then do your manual calculations if you wish to see if those are correctly done.